On 2018-11-14 15:10, Michal Srb wrote:
On středa 14. listopadu 2018 10:52:59 CET Riccardo Berto wrote:
I have a low quality screen. It's very bright, even at minimum
settings
in the monitor menu. I'm able to reduce the brightness with `xrandr
--output HDMI-0 --brightness 0.25` but sometimes the brightness goes
back to the default levels when downloading something from the browser
or doing peculiar interactions with the Xorg server, like opening the
file manager. I guess this is caused by a re-read of the xorg.conf
file
under certain circumstances that I'm not aware of.
The question is: is it possible to make the previously mentioned
xrandr
command permanent via some /etc/X11/xorg.conf.d/ conf file?
The xrandr's brightness parameter is just a multiplier for gamma, so
you
should be able to achieve the same thing with configuration like this:
Section "Monitor"
...
Gamma 0.25
EndSection
This is alternative way of setting the initial value instead of using
xrandr,
but it probably won't fix the random changing back at runtime. X server
does
not normally reload xorg.conf while it is running. It seems that some
application is intentionally changing the gamma at runtime, you should
try to
find out which one it is. Maybe some color management app? Don't you
have
redshift installed?
Michal
Thanks for the answer.
No, I don't use redshift. As far as I know, it can only happen twice
during each Xorg start up. After these 2 times and me readjusting the
backlight manually with the xrandr command previously posted, it stays
that way even for a week of continued usage. It has done that for years.
In the meantime I changed browsers, usage habits, Xorgs versions, PCs,
GPUs, drivers, ...
I have a keyboard shortcut with that xrandr command saved for this exact
reason as I have to execute it up to 3 times during each session. I
finally decided to go public with this issue as I can hardly bare the
default minimum brightness of my "new" subpar screen.
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