On Wed, 8 Jan 2020 16:38:32 +0100 (CET)
Felmon Davis <moelmoel2714@...> wrote:

> greets!
> 
> I was trying to get a second monitor (a tv) to work using xrandr. I 
> noticed that the screen on the laptop would suffer severe, almost 
> 'psychedelic', effects if I hit a certain setting.
> 
> unfortunately I don't recall the setting but the ill effect was 
> consistent and rendered the disply nearly unreadable. and the only 
> solution was to end the session.
> 
> then by accident I hit the 'save this configuration' key and now the 
> setting is permanent.
> 
> btw I created a second user and it doesn't suffer from the problem.
> 
> I cannot find a way to restore the proper display setting.

My guess is that you did something awkward to the color profile or
gamma correction.  No idea where that information is stored, though--I'd 
probably resort to grepping through likely directories looking for 
"[Cc]olor".  If it affects only a specific user, then the setting is probably 
in your home directory, since most distros don't like mingling user settings
with general system settings.

E. Liddell