[Bug 100687] KWin won't draw Aurorae themes under EGL

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=100687

            Bug ID: 100687
           Summary: KWin won't draw Aurorae themes under EGL
           Product: Mesa
           Version: 12.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: sonichedgehog_hyperblast00@yahoo.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 130849
  --> https://bugs.freedesktop.org/attachment.cgi?id=130849&action=edit
Screenshot

I initially reported this bug with openSUSE and the KDE teams. It was
ultimately concluded that it's a problem with Mesa or the Radeon driver. As
such I was encouraged to post about it here as well. Links to the other bug
reports:

https://bugzilla.opensuse.org/show_bug.cgi?id=1033598
https://bugs.kde.org/show_bug.cgi?id=378663

In summary: This is a problem that affects Linux users running the KDE desktop.
After a recent openSUSE Tumbleweed snapshot, I found that KWin no longer
renders Aurorae themes. Other themes work fine however, and this only affects
Aurorae ones... Plasma also has no issues rendering desktop elements. The
problem happens both with and without desktop effects enabled.

The space where the titlebar and border should be becomes completely empty,
with no graphics or text or buttons showing. However the blur effect is still
functional in those areas, and clicking and dragging on any window component
works correctly (even if they're invisible).

Today I found the culprit as well as a workaround, thanks to Martin Gräßlin in
the same report on the KDE bug tracker. The issue only happens when using egl
instead of glx as the backend of KWin. This can be modified by opening
~/.config/kwinrc in a text editor and changing:

GLPlatformInterface=egl

to

GLPlatformInterface=glx

Anyone with a Radeon card should be able to reproduce this, by doing the
reverse of the above and switching their KDE desktop to egl. I understand the
driver developers need to figure out what's breaking it, which hopefully won't
be difficult using this test case.

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