[Bug 97639] Intermittent flickering artifacts with AMD R7 260x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97639

            Bug ID: 97639
           Summary: Intermittent flickering artifacts with AMD R7 260x
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nucrap at hotmail.com

Created attachment 126306
  --> https://bugs.freedesktop.org/attachment.cgi?id=126306&action=edit
my Xorg.0.log

Hi, I am using an MSI R7 260x OC with the new amdgpu driver. Everything seems
to run fine (I have yet to experience any crashes), however there constantly
flicker some artifacts on my screen.
In the Xorg.0.log I have noticed many suspicious error messages similar to
this:

AMDGPU(0): amdgpu_dri2_flip_event_handler: Pageflip completion event has
impossible msc 100169 < target_msc 100170

Looking at the description in the source code, it fits the bug I experience:
> Check for too small vblank count of pageflip completion, taking wraparound
> into account. This usually means some defective kms pageflip completion,
> causing wrong (msc, ust) return values and possible visual corruption.

I saw there was a similar bug (bug#91540), but it has been marked as fixed some
time ago.

My config:
Linux v4.7.2 (amdgpu, cik and powerplay enabled)
xf86-video-ati v7.7.0
mesa v12.0.1
xorg-drivers v1.17
xserver v1.17.4
KDE Plasma 5 (kwin)

If you need any further info please ask.

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