[Bug 90182] Qt Applications won't start on the dedicated GPU (SIGABRT)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90182

            Bug ID: 90182
           Summary: Qt Applications won't start on the dedicated GPU
                    (SIGABRT)
           Product: Mesa
           Version: 10.5
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: paul at konecny.at
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 115334
  --> https://bugs.freedesktop.org/attachment.cgi?id=115334&action=edit
GLXINFO of radeon

Hi, I was trying to test the new kdenlive development build I noticed that it
wouldn't even start with DRI_PRIME=1 kdenlive.
I immediatedly got a SIGABRT
Same happened with an easy example program from the Qt project "openglunderqml"

"LANG=C R600_DEBUG=cs DRI_PRIME=1 QSG_INFO=1  '/home/paul/hybrid
test/build-openglunderqml-Desktop-Debug/openglunderqml'                         
QML debugging is enabled. Only use this in a safe environment.                  
openglunderqml: dri2.c:518: dri2_allocate_textures: Assertion
`drawable->textures[statt]' failed.                                    
Abgebrochen (Speicherabzug geschrieben)"

As Xonotic worked more or less ok on the radeon I filed a bug report at the Qt
project https://bugreports.qt.io/browse/QTBUG-45686
Laszlo Agocs from the Qt project states the following: 
"Might be a difficult one and not just because we lack any such hw to test on.
Cannot do much when glXMakeCurrent() crashes deep inside the driver.
Any chance for a backtrace with symbols? In the absence of that running with
QSG_INFO=1 could be helpful too.
Anyway, it's most likely happening in QGLXContext::queryDummyContext() where we
attempt to make a pbuffer surface current in order to query a few GL things.
Other apps may not rely on pbuffers and thus may not exhibit the issue."

I'm not a programmer so please go easy on me. If you need additional info let
me know (and maybe tell me how to fetch it for you ;) )

Thanks!

Hardware: HP EliteBook 850 G1 with Intel (HD4400) / AMD (HD8750M, OLAND) hybrid
graphics
Software:
ArchLinux (Antergos)
Linux 3.19.3
mesa 10.5.4 Intel / Radeon exact glxinfo outputs are attached
Qt 5.4.1

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