[Bug 74053] [ivb] hang on rcs pageflip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74053

--- Comment #19 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #18)
> Created attachment 93534 [details]
> crash dump when using patch from comment #13
> 
> Tried patch from comment #13 . Apparently it didn't solved the issue,

That's actually reassuring. The crash dump shows that the patch is working and
the GPU is awake, so forcewake is definitely not an issue here.

> but
> there is some notable change: usually I was able to spot the hang because
> everything freeze, only the mouse moves. Eventually and often, for some very
> weird reason, firefox fonts are corrupted, some latin letter is replaced
> with non latin one or anyway some other symbol, the only fix is to restart
> firefox. This time just the latter happened. Luckly I checked dmesg and I
> saw the "stuck at render ring" notification.

That just sounds like the usual dangers with a hung gpu and discarding work
before resetting. (We have plans to fix it.)

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