Does turning off the screen make that much of a difference to battery
life actually? I'm unsure since I've heard so many claims over the years
of it does, it doesn't, it does but only this much, etc
On 10/18/22 15:01, Linux for blind general discussion wrote:
Tim here. I believe xrandr should let you do this. First, you
need to get the name of your display according to xrandr:
$ xrandr | awk '/primary/{print $1}'
LVDS-1
For me that's "LVDS-1" but your output might be different, like
"VGA" or "HDMI-1" or something.
You should then be able to disable/power-down that display with
$ xrandr --output LVDS-1 --off
If you need to re-enable it for whatever reason, change the "off"
to "auto":
$ xrandr --output LVDS-1 --auto
I'm not sure how this interacts with screen-readers, and based on
my testing, it feels like applications might go a little weird,
getting resized to an itty-bitty size (I think my texting xterm got
resized down to fit in a 320x200 display, since it was shrunk down
when I re-enabled the screen).
If it's a problem for you, there might be a way to create a
virtual monitor, by including something like
SubSection "Display"
Depth 24
Virtual 1024 768
EndSubSection
in the "Screen" section of your xorg.conf file. X should then think
you have two displays connected to your system, and you can use the
`xrandr ... --off` command to turn off the real one while still
having the virtual one of a size large enough to make X programs
happy.
Or possibly run "xvfb" to create a virtual X environment, possibly
adding the physical display to its configuration, and then using
xrandr to disable the real screen?
Just a few ideas,
-Tim
On 2022-10-18 07:41, Linux for blind general discussion wrote:
Hello everyone,
Ubuntu Mate 22.04 64-bit.
I suppose there are multiple ways to go about turning off the laptop
screen on Linux, from switches to more invasive configuration modifications.
I wonder, what is the ideal solution for us to set up, so it would be
possible to turn off the screen, so we could save battery, protect the
displayed information etc. but we could at the same time switch the
setting when necessary without the need to log out / restart?
Thanks for your advices!
Best regards
Rastislav
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