[Bug 55500] [sna gen4] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #141 from Harald Judt <h.judt at gmx.at> ---
(In reply to comment #134)
> (In reply to comment #132)
> > I don't want to speak too soon but it seems that the latest patch fixes the
> > problem.
> 
> Let it run for a day or so to be sure. The other thing that is worth
> checking is whether setting MAX_FLUSH_VERTICES to 2 is also stable, or 4
> etc. Setting it to 1 has a major impact on performance (we are roughly an
> order of magnitude slower at rendering than what can be expected).

Setting max_flush_vertices to 1 fixes the problem here, with the mentioned
noticeable performance loss. IIRC, hibernating/resuming can accelerate the
appearance of the bug, but I'm not quite sure about this, it might also be
coincidence.

I will now try to decrease the value from the default one to find the sweet
spot.

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