Bugzilla

So far we know that:
 - Two reporters both using AMD GPUs (thanks a ton darkspirit for digging up the reddit thread), not quite the same model (device ids 0x67ef and 0x67df) but both in the Radeon 400 series.
 - Not specific to WebRender or the compositor (which is surprising for this type of bug)
 - Somehow this seems to not affect fully transparent fragments (I suppose the GPU detects and discards them before blending). If the issue was happening while sampling from a texture I would expect the alpha to be uniformly wrong just like the color for the text from the reddit thread.

This smells like a driver or hardware issue. I wasn't able to reproduce it but I don't have any AMD hardware handy. The next step would be to try newer drivers and see if it fixes the issue.

alklein2112, your driver is from 2017, it's likely that AMD has released newer graphics driver since then. Would it be possible for you to update the driver and report whether the issue is still present?

So far we know that:
 - Two reporters both using AMD GPUs (thanks a ton darkspirit for digging up the reddit thread), not quite the same model (device ids 0x67ef and 0x67df) but both in the Radeon 400 series.
 - Not specific to WebRender or the compositor (which is surprising for this type of bug)
 - Somehow this seems to not affect fully transparent fragments (I suppose the GPU detects and discards them before blending). If the issue was happening while sampling from a texture I would expect the alpha to be uniformly wrong just like the color for the text from the reddit thread.

This smells like a driver or hardware issue. I wasn't able to reproduce it but I don't have any AMD hardware handy. The next step would be to try newer drivers and see if it fixes the issue.

alklein2112, your driver is from 2017, it's likely that AMD has released newer graphics drivers since then. Would it be possible for you to update the driver and report whether the issue is still present?