Created attachment 254857 [details] Picture of the corruption when rightclicking in websites in chromium There is a graphical garbage in the dropdown menu when right clicking any plasma application, tooltips in any plasma application, it flashes very briefly and is very partial regardless if I move the mouse cursor. Same with chromium, but it happens more often and is more severe when rightclicking inside a website. It doesn't disappear in this case until you move the mouse cursor anywhere over the dropdown menu, if I right click the ui itself in chromium(bookmarks bar) it flashes very briefly and is very partial regardless if I move the mouse cursor over the dropdown menu. It sometimes happen very briefly across the whole window when opening a new window for Gwenview. This started to happen after upgrading from kernel 4.8.13 to 4.9.6, it still happens in 4.10.0. Different mesa version makes no difference.
Created attachment 254859 [details] dmesg output
Created attachment 254861 [details] xorg log
The example shown in the image is easily reproducible for me by just right clicking over and over and it will appear.
I can't seem to reproduce this on my Tonga. Was it really only the kernel that made the difference? No updates for kwin / Mesa / xf86-video-amdgpu / xserver / Mesa / ... in the meantime? What kwin compositor settings are you using? If it's really only the kernel, can you bisect between 4.8.13 and 4.9.6?
I tested all the way to back to kwin 5.7.5, issue still appears, tested mesa from git, 13.0, 17.0 issue still persist. Xserver 1.19 and the latest xf86-video-amdgpu has been used long before this issue appeared. Tried different kwin compositor settings, no change either. The only thing that helps is to downgrade to kernel 4.8.13. I don't know how to bisect to be honest.
Does the firmware here help? https://people.freedesktop.org/~agd5f/radeon_ucode/tonga/
Unfortunatly no.
Does reverting 646cccb55b26b95b981ea9a63512260d0c21cac3 help?
No. I applied it to 4.9.11, running the firmware files you suggested to try.
The issue became even more prevelant when upgrading from kernel 4.10.2 to 4.10.3.