[Nouveau] [Bug 92077] nouveau graphics freeze when using KDE Plasma 5; PGR engine fault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92077

--- Comment #30 from Andrey Mazo <ahippo at yandex.ru> ---
(In reply to Ilia Mirkin from comment #29)
> Can someone see whether sticking
> 
> QSG_RENDER_LOOP=basic
> 
> into /etc/environment helps anything?

I could try, but looks like it's used by default already:

$ QT_LOGGING_RULES="qt.scenegraph.general=true" plasmawindowed
org.kde.plasma.systemmonitor.net
qt.scenegraph.general: QSG: basic render loop
qt.scenegraph.general: texture atlas dimensions: 1024x512
qt.scenegraph.general: R/G/B/A Buffers:    8 8 8 8
qt.scenegraph.general: Depth Buffer:       24
qt.scenegraph.general: Stencil Buffer:     8
qt.scenegraph.general: Samples:            -1
qt.scenegraph.general: GL_VENDOR:          nouveau
qt.scenegraph.general: GL_RENDERER:        Gallium 0.4 on NVD9
qt.scenegraph.general: GL_VERSION:         3.0 Mesa 12.0.1
...


I don't know for sure, which one was used when I reported the problem
originally (comment 17) or when captured an apitrace (comment 23).
But I would guess, that it was the same based on the following [1]:
"""
The non-threaded render loop is currently used by default ... Linux with Mesa
drivers.
"""

[1]
http://doc.qt.io/qt-5/qtquick-visualcanvas-scenegraph.html#non-threaded-render-loops-basic-and-windows

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