If the brightness of the built-in display is turned black, can it be considered off?
up vote
7
down vote
favorite
Model: MacBook Pro (Retina, 13-inch, Mid 2014) OS: 10.13.6
I connect an external monitor to the macbook, set the Arrangement to be Mirror Displays and then use the keyboard F1 to dim the built-in display to black. It seems it's off and even the back apple log is black (since it's using the same light as the monitor).
So, can I consider the built-in display it's off? (means it will not use any hardware/software resources such as CPU/RAM etc..). Thanks.
macbook display
asked Nov 30 at 12:39
sgon00
1859
add a comment |
up vote
7
down vote
favorite
Model: MacBook Pro (Retina, 13-inch, Mid 2014) OS: 10.13.6
I connect an external monitor to the macbook, set the Arrangement to be Mirror Displays and then use the keyboard F1 to dim the built-in display to black. It seems it's off and even the back apple log is black (since it's using the same light as the monitor).
So, can I consider the built-in display it's off? (means it will not use any hardware/software resources such as CPU/RAM etc..). Thanks.
macbook display
asked Nov 30 at 12:39
sgon00
1859
My guess is that the display is still using resources, just not the LED to light the screen. The info is still going to the screen, you just can't see it.
– fsb
Nov 30 at 12:47
@fsb, yeah, you are right. the below answer shows a way to use Digital Color Meter to prove it's using resources. very smart.
– sgon00
Nov 30 at 14:18
add a comment |
up vote
7
down vote
favorite
up vote
7
down vote
favorite
Model: MacBook Pro (Retina, 13-inch, Mid 2014) OS: 10.13.6
I connect an external monitor to the macbook, set the Arrangement to be Mirror Displays and then use the keyboard F1 to dim the built-in display to black. It seems it's off and even the back apple log is black (since it's using the same light as the monitor).
So, can I consider the built-in display it's off? (means it will not use any hardware/software resources such as CPU/RAM etc..). Thanks.
macbook display
asked Nov 30 at 12:39
sgon00
1859
Model: MacBook Pro (Retina, 13-inch, Mid 2014) OS: 10.13.6
I connect an external monitor to the macbook, set the Arrangement to be Mirror Displays and then use the keyboard F1 to dim the built-in display to black. It seems it's off and even the back apple log is black (since it's using the same light as the monitor).
So, can I consider the built-in display it's off? (means it will not use any hardware/software resources such as CPU/RAM etc..). Thanks.
macbook display
macbook display
asked Nov 30 at 12:39
sgon00
1859
asked Nov 30 at 12:39
sgon00
1859
asked Nov 30 at 12:39
sgon00
1859
asked Nov 30 at 12:39
sgon00
1859
asked Nov 30 at 12:39
sgon00
1859
1859
My guess is that the display is still using resources, just not the LED to light the screen. The info is still going to the screen, you just can't see it.
– fsb
Nov 30 at 12:47
@fsb, yeah, you are right. the below answer shows a way to use Digital Color Meter to prove it's using resources. very smart.
– sgon00
Nov 30 at 14:18
add a comment |
My guess is that the display is still using resources, just not the LED to light the screen. The info is still going to the screen, you just can't see it.
– fsb
Nov 30 at 12:47
@fsb, yeah, you are right. the below answer shows a way to use Digital Color Meter to prove it's using resources. very smart.
– sgon00
Nov 30 at 14:18
My guess is that the display is still using resources, just not the LED to light the screen. The info is still going to the screen, you just can't see it.
– fsb
Nov 30 at 12:47
My guess is that the display is still using resources, just not the LED to light the screen. The info is still going to the screen, you just can't see it.
– fsb
Nov 30 at 12:47
@fsb, yeah, you are right. the below answer shows a way to use Digital Color Meter to prove it's using resources. very smart.
– sgon00
Nov 30 at 14:18
@fsb, yeah, you are right. the below answer shows a way to use Digital Color Meter to prove it's using resources. very smart.
– sgon00
Nov 30 at 14:18
add a comment |
4 Answers
4
active
oldest
votes
up vote
11
down vote
accepted
The display is still using resources. You can prove this by opening the Digital Colour Meter. Just hover your mouse to the built-in display which is currently dark. You will still see the content in the Digital Colour Meter on your second screen.
answered Nov 30 at 13:07
Yannick
12615
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Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
3
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
add a comment |
up vote
10
down vote
Even the physical LCD is still active with the backlight off. On older laptops, you can shine a light (i.e. phone flashlight) through the apple on the back of the display and see a spot of the display, but the new ones are lame and don't have a glowing apple*.
* Sarcasm... I think
answered Nov 30 at 17:21
Dev
460319
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
add a comment |
up vote
5
down vote
No, the display can still be running and taking power even if the backlight is off.
The display has three major hardware components: a backlight, an array of colour filters, and an array of LCDs.
The backlight takes a lot of power, but is conceptually very simple: it just emits white light evenly across its area. The colour filters are complex (with red, green, and blue areas for each pixel) but fixed and don't take any power. The LCD array is equally complex, but also takes power: it has to filter the light differently for each pixel, letting all the light through for white pixels, blocking it for black pixels, and in between for other colours and shades.
So when the display is running, the LCD cells are working and taking power, even if the backlight is providing little or no light. (This also means that the graphics card and all the associated circuitry is running too.)
I can verify this from personal experience: I had the backlight die on a 2015 MacBook Pro. At first, I thought the entire machine had died. But after a while I thought of shining a torch through the apple-shaped translucent panel: and sure enough, it revealed a small patch of desktop background and the edge of a window — I could even see the pointer when I moved it across that area. That indicated it was just the backlight that had died.
So no, the LCD array, graphics card, and all the other display-related hardware and software &c can still be running and taking power even without the backlight.
This probably applies across most or all types of LCD display. (It's possible that some combinations of hardware and software may automatically shut down those things when you turn the brightness down to zero. But they don't in my case.)
answered Nov 30 at 18:06
gidds
1861
add a comment |
up vote
1
down vote
The display itself still takes power (see gidde's answer).
Since you are mirroring, your Mac does relatively little extra work. It has to generate images anyway for the second monitor, and that's the biggest chunk of work the computer does, and is not duplicated.
The Mac then needs to send the contents of its video memory to two connectors - normally it would be one, but since you are mirroring, the same video memory is sent to two connectors. So some extra work is done, but not very much.
All in all, it will use few resources, but not none at all.
answered Dec 1 at 19:56
gnasher729
42126
add a comment |
4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
11
down vote
accepted
The display is still using resources. You can prove this by opening the Digital Colour Meter. Just hover your mouse to the built-in display which is currently dark. You will still see the content in the Digital Colour Meter on your second screen.
answered Nov 30 at 13:07
Yannick
12615
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
3
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
add a comment |
up vote
11
down vote
accepted
The display is still using resources. You can prove this by opening the Digital Colour Meter. Just hover your mouse to the built-in display which is currently dark. You will still see the content in the Digital Colour Meter on your second screen.
answered Nov 30 at 13:07
Yannick
12615
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
3
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
add a comment |
up vote
11
down vote
accepted
up vote
11
down vote
accepted
The display is still using resources. You can prove this by opening the Digital Colour Meter. Just hover your mouse to the built-in display which is currently dark. You will still see the content in the Digital Colour Meter on your second screen.
answered Nov 30 at 13:07
Yannick
12615
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The display is still using resources. You can prove this by opening the Digital Colour Meter. Just hover your mouse to the built-in display which is currently dark. You will still see the content in the Digital Colour Meter on your second screen.
answered Nov 30 at 13:07
Yannick
12615
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Nov 30 at 13:07
Yannick
12615
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Nov 30 at 13:07
Yannick
12615
answered Nov 30 at 13:07
Yannick
12615
12615
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yannick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
3
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
add a comment |
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
3
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
Yeah, you are right. I never knew Digital color meter before. This is so cool. It definitely proves the display is still using resources. Thanks a lot.
– sgon00
Nov 30 at 13:58
3
3
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
This test is inconclusive. You could do the same with an external VGA monitor (VGA to render the Mac unable know whether the monitor is actually turned on): connect the monitor, press its Power button to turn it off, try getting some colors from the part of desktop which is supposed to be on the external monitor: you'll still get some non-zero values. But in this case the monitor is off by construction of the experiment.
– Ruslan
Dec 1 at 15:30
add a comment |
up vote
10
down vote
Even the physical LCD is still active with the backlight off. On older laptops, you can shine a light (i.e. phone flashlight) through the apple on the back of the display and see a spot of the display, but the new ones are lame and don't have a glowing apple*.
* Sarcasm... I think
answered Nov 30 at 17:21
Dev
460319
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
add a comment |
up vote
10
down vote
Even the physical LCD is still active with the backlight off. On older laptops, you can shine a light (i.e. phone flashlight) through the apple on the back of the display and see a spot of the display, but the new ones are lame and don't have a glowing apple*.
* Sarcasm... I think
answered Nov 30 at 17:21
Dev
460319
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
add a comment |
up vote
10
down vote
up vote
10
down vote
Even the physical LCD is still active with the backlight off. On older laptops, you can shine a light (i.e. phone flashlight) through the apple on the back of the display and see a spot of the display, but the new ones are lame and don't have a glowing apple*.
* Sarcasm... I think
answered Nov 30 at 17:21
Dev
460319
Even the physical LCD is still active with the backlight off. On older laptops, you can shine a light (i.e. phone flashlight) through the apple on the back of the display and see a spot of the display, but the new ones are lame and don't have a glowing apple*.
* Sarcasm... I think
answered Nov 30 at 17:21
Dev
460319
edited yesterday
answered Nov 30 at 17:21
Dev
460319
answered Nov 30 at 17:21
Dev
460319
answered Nov 30 at 17:21
Dev
460319
460319
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
add a comment |
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
the new ones are lame and don't have a glowing apple* (*not sarcasm XD). Also the polarizing filters are never perfect.. with a strong enough flashlight, you can shine it at the front, and enough light will make it through to see that the LCD is still displaying an image.
– Aaron
Nov 30 at 19:06
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Yep, although my screen protector (privacy filter) makes that slightly harder, so the apple is easier.
– Dev
Nov 30 at 20:51
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
Oh, the glowing apple is actually using the LCD backlight? That's smart! I always thought they just had another light in there controlled by software. +1!
– SilverWolf
Dec 1 at 17:19
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
You'd have to make the display thicker for that, lol! I also think it's cool, sad the newer laptops don't have it though.
– Dev
Dec 1 at 23:55
add a comment |
up vote
5
down vote
No, the display can still be running and taking power even if the backlight is off.
The display has three major hardware components: a backlight, an array of colour filters, and an array of LCDs.
The backlight takes a lot of power, but is conceptually very simple: it just emits white light evenly across its area. The colour filters are complex (with red, green, and blue areas for each pixel) but fixed and don't take any power. The LCD array is equally complex, but also takes power: it has to filter the light differently for each pixel, letting all the light through for white pixels, blocking it for black pixels, and in between for other colours and shades.
So when the display is running, the LCD cells are working and taking power, even if the backlight is providing little or no light. (This also means that the graphics card and all the associated circuitry is running too.)
I can verify this from personal experience: I had the backlight die on a 2015 MacBook Pro. At first, I thought the entire machine had died. But after a while I thought of shining a torch through the apple-shaped translucent panel: and sure enough, it revealed a small patch of desktop background and the edge of a window — I could even see the pointer when I moved it across that area. That indicated it was just the backlight that had died.
So no, the LCD array, graphics card, and all the other display-related hardware and software &c can still be running and taking power even without the backlight.
This probably applies across most or all types of LCD display. (It's possible that some combinations of hardware and software may automatically shut down those things when you turn the brightness down to zero. But they don't in my case.)
answered Nov 30 at 18:06
gidds
1861
add a comment |
up vote
5
down vote
No, the display can still be running and taking power even if the backlight is off.
The display has three major hardware components: a backlight, an array of colour filters, and an array of LCDs.
The backlight takes a lot of power, but is conceptually very simple: it just emits white light evenly across its area. The colour filters are complex (with red, green, and blue areas for each pixel) but fixed and don't take any power. The LCD array is equally complex, but also takes power: it has to filter the light differently for each pixel, letting all the light through for white pixels, blocking it for black pixels, and in between for other colours and shades.
So when the display is running, the LCD cells are working and taking power, even if the backlight is providing little or no light. (This also means that the graphics card and all the associated circuitry is running too.)
I can verify this from personal experience: I had the backlight die on a 2015 MacBook Pro. At first, I thought the entire machine had died. But after a while I thought of shining a torch through the apple-shaped translucent panel: and sure enough, it revealed a small patch of desktop background and the edge of a window — I could even see the pointer when I moved it across that area. That indicated it was just the backlight that had died.
So no, the LCD array, graphics card, and all the other display-related hardware and software &c can still be running and taking power even without the backlight.
This probably applies across most or all types of LCD display. (It's possible that some combinations of hardware and software may automatically shut down those things when you turn the brightness down to zero. But they don't in my case.)
answered Nov 30 at 18:06
gidds
1861
add a comment |
up vote
5
down vote
up vote
5
down vote
No, the display can still be running and taking power even if the backlight is off.
The display has three major hardware components: a backlight, an array of colour filters, and an array of LCDs.
The backlight takes a lot of power, but is conceptually very simple: it just emits white light evenly across its area. The colour filters are complex (with red, green, and blue areas for each pixel) but fixed and don't take any power. The LCD array is equally complex, but also takes power: it has to filter the light differently for each pixel, letting all the light through for white pixels, blocking it for black pixels, and in between for other colours and shades.
So when the display is running, the LCD cells are working and taking power, even if the backlight is providing little or no light. (This also means that the graphics card and all the associated circuitry is running too.)
I can verify this from personal experience: I had the backlight die on a 2015 MacBook Pro. At first, I thought the entire machine had died. But after a while I thought of shining a torch through the apple-shaped translucent panel: and sure enough, it revealed a small patch of desktop background and the edge of a window — I could even see the pointer when I moved it across that area. That indicated it was just the backlight that had died.
So no, the LCD array, graphics card, and all the other display-related hardware and software &c can still be running and taking power even without the backlight.
This probably applies across most or all types of LCD display. (It's possible that some combinations of hardware and software may automatically shut down those things when you turn the brightness down to zero. But they don't in my case.)
answered Nov 30 at 18:06
gidds
1861
No, the display can still be running and taking power even if the backlight is off.
The display has three major hardware components: a backlight, an array of colour filters, and an array of LCDs.
The backlight takes a lot of power, but is conceptually very simple: it just emits white light evenly across its area. The colour filters are complex (with red, green, and blue areas for each pixel) but fixed and don't take any power. The LCD array is equally complex, but also takes power: it has to filter the light differently for each pixel, letting all the light through for white pixels, blocking it for black pixels, and in between for other colours and shades.
So when the display is running, the LCD cells are working and taking power, even if the backlight is providing little or no light. (This also means that the graphics card and all the associated circuitry is running too.)
I can verify this from personal experience: I had the backlight die on a 2015 MacBook Pro. At first, I thought the entire machine had died. But after a while I thought of shining a torch through the apple-shaped translucent panel: and sure enough, it revealed a small patch of desktop background and the edge of a window — I could even see the pointer when I moved it across that area. That indicated it was just the backlight that had died.
So no, the LCD array, graphics card, and all the other display-related hardware and software &c can still be running and taking power even without the backlight.
This probably applies across most or all types of LCD display. (It's possible that some combinations of hardware and software may automatically shut down those things when you turn the brightness down to zero. But they don't in my case.)
answered Nov 30 at 18:06
gidds
1861
answered Nov 30 at 18:06
gidds
1861
answered Nov 30 at 18:06
gidds
1861
answered Nov 30 at 18:06
gidds
1861
1861
add a comment |
add a comment |
up vote
1
down vote
The display itself still takes power (see gidde's answer).
Since you are mirroring, your Mac does relatively little extra work. It has to generate images anyway for the second monitor, and that's the biggest chunk of work the computer does, and is not duplicated.
The Mac then needs to send the contents of its video memory to two connectors - normally it would be one, but since you are mirroring, the same video memory is sent to two connectors. So some extra work is done, but not very much.
All in all, it will use few resources, but not none at all.
answered Dec 1 at 19:56
gnasher729
42126
add a comment |
up vote
1
down vote
The display itself still takes power (see gidde's answer).
Since you are mirroring, your Mac does relatively little extra work. It has to generate images anyway for the second monitor, and that's the biggest chunk of work the computer does, and is not duplicated.
The Mac then needs to send the contents of its video memory to two connectors - normally it would be one, but since you are mirroring, the same video memory is sent to two connectors. So some extra work is done, but not very much.
All in all, it will use few resources, but not none at all.
answered Dec 1 at 19:56
gnasher729
42126
add a comment |
up vote
1
down vote
up vote
1
down vote
The display itself still takes power (see gidde's answer).
Since you are mirroring, your Mac does relatively little extra work. It has to generate images anyway for the second monitor, and that's the biggest chunk of work the computer does, and is not duplicated.
The Mac then needs to send the contents of its video memory to two connectors - normally it would be one, but since you are mirroring, the same video memory is sent to two connectors. So some extra work is done, but not very much.
All in all, it will use few resources, but not none at all.
answered Dec 1 at 19:56
gnasher729
42126
The display itself still takes power (see gidde's answer).
Since you are mirroring, your Mac does relatively little extra work. It has to generate images anyway for the second monitor, and that's the biggest chunk of work the computer does, and is not duplicated.
The Mac then needs to send the contents of its video memory to two connectors - normally it would be one, but since you are mirroring, the same video memory is sent to two connectors. So some extra work is done, but not very much.
All in all, it will use few resources, but not none at all.
answered Dec 1 at 19:56
gnasher729
42126
answered Dec 1 at 19:56
gnasher729
42126
answered Dec 1 at 19:56
gnasher729
42126
answered Dec 1 at 19:56
gnasher729
42126
42126
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My guess is that the display is still using resources, just not the LED to light the screen. The info is still going to the screen, you just can't see it.
– fsb
Nov 30 at 12:47
@fsb, yeah, you are right. the below answer shows a way to use Digital Color Meter to prove it's using resources. very smart.
– sgon00
Nov 30 at 14:18