Overexposed desktop

[Igor Rylov]

hello, for whatever reason, the next time I've booted up, my desktop became completley black. I mean, the graphical login was visible, the black screen was happening after logging in.I tried different desktops, that were installed: Gnome 3, Unity, LXDE, Xfce, but i was always getting black screen. I don't know, why it happened. Possibly, something got updated and it caused this problem.
It happened about a 2 months ago. After spending a couple of days troubleshooting it, nothing helped, so I desided to do the unthinkable, upgrade my LTS 22.04 Ubuntu to the latest version, that was at the time 23.04. It fixed the black screen, but the picture became overexposed:

I tried to install drivers from different unofficial repositories, but none of them changed the situation, so I returned the drivers from the official repository.I tried using xrandr and other utilities to change contrast, brightness and gamma with using reference pictures for adjusting those values, but it didn't help. White range was still cut off after certain value, but it just became more dimm, when I tried to lower those values and lower range of blacks was cut off on the lower range even when trying to raise those values.The only time, when picture became normal was, when I loaded LXDE and openbox:


Gnome 3, Unity and Xfce were openexposed.
I tried to do: openbox --replace after loading different DE, but it didn't work with Gnome 3 and Unity, but it worked on Xfce. Also, metacity --replace works on Xfce, but, even though, it mostly looks normal on Xfce, some programs still are overexposed.I think, the programs, that have modern interfaces. Some pdf/fb2/epub readers, Blender, mpv, GoDot, etc, Ubuntu's Software store are still overexposed even in xfce or lxde with openbox or metacity.
I've noticed one thing, when loading the Desktop Environment:On login screen the picture is normal, not overexposed.
Then, after entering username/password, the desktop starts loading normal (not overexposed).
Then, a few seconds after login screen disappears, while still seeing a wall paper, over desktops, seems like some transparent rectangle gets loaded taking almost an entire screen, not reaching edges only about 1 centimeter around it and under it's transparency, the wallpaper gets overexposed, then shortly after the whole screen gets overexposed.
I tried to disable all the programs, that autostart, but none of them cause it.Maybe there is something gets loaded by system, that causes it.
My graphics card is AMD: Wani [Radeon R5/R6/R7 Graphics]/Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445 / 530/535 / 620/625 Mobile]Linux cooldown-nb-acer 6.2.0-24-generic #24-Ubuntu SMP PREEMPT_DYNAMIC Fri Jun 16 12:03:50 UTC 2023 x86_64 x86_64 x86_64 GNU/LinuxXOrg Version: 1:7.7+23ubuntu2
  
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