[Bug 97119] New: screen distortion under KDE when running without compositor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97119

            Bug ID: 97119
           Summary: screen distortion under KDE when running without
                    compositor
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: johannes.hirte at datenkhaos.de
        QA Contact: xorg-team at lists.x.org

Created attachment 125385
  --> https://bugs.freedesktop.org/attachment.cgi?id=125385&action=edit
screenshot.png

When running without compositor, I get the screen distortion like in the
screenshot on my Carrizo. This can be triggered either by disabling the
checkbox "Enable compositor on startup" in the kwin config or by enabling
"Suspend compositor for full screen windows", start an application in
fullscreen like mpv and switch to another virtual desktop. The distortions go
away after reenabling the compositor, but I have heavy flickering around the
window that has the focus. Switching focus or resizing the window helps
temporarily but reappears with every newly opened window. At least logout and
re-login into X is needed.

Hardware is a "CARRIZO" (ChipID = 0x9874)

software components are:

xserver 1.18.4
llvm git (at commit 5e00cf65e23656cbeba353efb5a7d85ba8e25f4a)
drm git (at commit 0caa84cb046156b9b2ca248d32af9548b04316e1)
mesa git (at commit 2f57e578812f277c87966279a728dd2a60b4e9be)
xf86-video-amdgpu git (at commit abd1a7901c95e4bc78415cf1b7923623b9177152)

kernel 4.7.0-04773-g194dc87

Gentoo Linux

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