xrandr brightness settings permanent

[Riccardo Berto]

On 2018-11-15 08:25, Michal Srb wrote:
> On středa 14. listopadu 2018 21:22:28 CET Riccardo Berto wrote:
>> 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.
> 
> What desktop environment are you using? I know that at least KDE/Plasma 
> has
> its own configuration for gamma and will apply it itself on start.
> 
> Michal

I'm using Gnome 3.30.

I provide you with an example so it's more clear (I hope):
I just booted and logged in. I execute the xrandr command once to lower 
the insane brightness level. I open nautilus (file manager), try to 
trash some file by selecting it and pressing the DELETE button --> Xorg 
resets the gamma settings to the default value. The only thing that 
appeared on the screen that may have caused this is the "_filename_ was 
moved to trash" greyish notification on the top side of the window, near 
the title bar of nautilus. Nothing changed in the system except for that 
notification and the file that is now in the trash. This behavior is 
reproducible 100% of the times, after a boot.
I then execute the xrandr command to lower the brightness level as it 
was reseted. If I trash something else, even with that notification 
popping up, it won't reset again unless I reboot. I'm now in the middle 
state of this weird behavior. I'm sure that it will resets again somehow 
and if I lower the gamma with that xrandr command for the third time, it 
won't reset by itself ever again until the next boot.