I don’t know since the colors seem correct on other distros, but this also may be related to the backlight on the screen. Potentially, if for some reason that light is dimmed, it could cause this type issue.
On my system I find this
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness with value 12595
If that is the correct location then I do not know what settings there may be valid. I did however try a couple settings above and below the value given and noted the screen brightness change each time I set a new value there.
I used # echo "12595" > sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness to make the changes with only changing the value that was echoed for each test. Note that I was logged in as root and did not use sudo for that test.
An incorrect value may cause damage but it could be worth a try. You will need to locate the proper location for your system…
