Oh! I got it, Thanks a lot!
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https://bugs.launchpad.net/bugs/1928294
Title:
gamma adjustment not working
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Oh nevermind. I see the problem. You are in a Wayland session where the
'xgamma' and 'xrandr' commands are not expected to work. If you want to
use them you will probably need to log into 'Ubuntu on Xorg'. I don't
know of any equivalent commands for Wayland sessions, and they would
need to be
Thanks for the bug report. Please run:
sudo apt install drm-info
drm_info > drminfo.txt
and then attach the resulting text file here.
Do you also find the Night Light feature in 'Settings > Screen Display'
is nonfunctional?
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