Can you provide a photo of the problem?
Please also try:
Settings > Colour > (your monitor) = OFF
and then log in again.
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https://bugs.launchpad.net/bugs/1970279
Title:
[amdgpu]
In the Xorg session.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1970279
Title:
[amdgpu] My monitor image turned yellow.
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