I have an RX 5700 card connected to a monitor which doesn't display dark colors very well. The brightness needs to be adjusted in software. I use the xcalib tool like this:
xcalib -a -b 10 -co 90
This displays dark colors well, but some images/videos have weird artifacts. After playing with a color picker it looks like colors that have the green component zero are much brighter than they should be. For example, color #750000 is much brighter than #750100. I'll attach some images that show the problem.
When the monitor is connected to a different computer (with a non-AMD GPU) configured with the same xcalib commands, the problem disappears, so it seems to be specific to the hardware/driver.
Please let me know if you need more information.
Created attachment 145833 [details]
Created attachment 145834 [details]
Displayed red gradient
This is a photo of the monitor displaying the first attached image.
-- GitLab Migration Automatic Message --
This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/946.