[Bug 109298] AMDGPU leaving DRI2 enabled causes white artifacting

[bugzilla-daemon@freedesktop.org]

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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).

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