https://bugs.freedesktop.org/show_bug.cgi?id=109298

Bug ID: 109298 Summary: AMDGPU leaving DRI2 enabled causes white artifacting Product: DRI Version: XOrg git Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: tkdestroyer2+bugs-freedesktop@gmail.com

I am running: Solus OS Linux kernel 4.18.5 xorg-driver-video-amdgpu 18.1.0 xinit 1.4.0 xorg-server 1.20.3 VG248QE DisplayPort 1080@144

$ cat /sys/class/drm/card1/device/vbios_version MS-V30823-F5

I have an MSI R9 390, one of the bugged ones. I can boot successfully using cik_support=1 dpm=1 and dc=1.

The bug I am encountering is the following:

- Use default Xorg configuration - Encounter white rectangles where there should be rendered content ex: Desktop background is between 6 and 9 tenths white starting from the top going down. Only the rest of the bottom strip is showing. ex: Firefox shows white rectangles of white pixels where there should be content. They vary in size and position and tend to show up after recent renderings. Can be 'wiped' away using the mouse-highlight.

I have managed to reduce the impact of this bug by switching off DRI2 by setting xorg configuration option AccelMethod to none. No other configuration of options (as they appear in the manpages for amdgpu) will work in removing these issues. This lets me utilize accelerated 3D graphics until I can get DRI2 up and running again.

It may be important to note that some applications will work, particularly when they are small windows, like when first opening a PDF. Scrolling and everything works normally, but when one maximizes the window to 1080p, the artifacts appear. One application that worked is MineTest, which appears to be using 2D rendering (poor performance with DRI2 off).