[Mesa-dev] [Bug 100262] libswrAVX2.so Causes hang with QOpenGLWidget

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100262

--- Comment #2 from chris at circlecvi.com ---
(In reply to Tim Rowley from comment #1)
> Not seeing a hang here, but a transparent area where the OpenGL should be
> rendered to.
> 
> what version of Mesa and Qt were you using?
> 
> If you don't mind running an experiment, could you try setting
> KNOB_MAX_WORKER_THREADS=4 in the environment before running hellogl2?  This
> will stop swr from binding threads which might possibly be confusing Qt's
> internal threading.

Hi Tim!

I tested on Qt 4.8.6 and 5.6.1, both cause a hang for me using the SWR driver
on Mesa 13.0.1 and 13.0.5

Setting the MAX_KNOB_WORKER_THREADS=4 seems to correct the issue!

Can you tell me if this is a permanent fix? Also does this need to change with
the number of CPUs available? I have field deployments experiencing these
issues.

Thanks!

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