[Bug 74053] [ivb] hang on rcs pageflip

[bugzilla-daemon at freedesktop.org]

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

--- Comment #22 from Enrico Tagliavini <enrico.tagliavini at gmail.com> ---
Well no hangs for now! I downloaded the 3.13.2 kernel, applied the patch again
and compiled it. From now on I'll start using this instead of the 3.13.1.

The difference I might experience compared to when running without the patch,
but I'm not sure at all, if there is a difference it is quite small: during
firefox rendering (or something else inside the app) freeze for a fraction of
second (like half second or so). During such short and temporary freezes it
was, rarely, happening the hang. As I said now there is no GPU hang, dmesg is
always 100% clear for drm and i915  stuff, but those micro freezes might be a
little more frequent with the patch. Again I want to stress this is very hard
to quantify and so feel free to simply ignore this. It might just be part of
the fact I'm keeping a lot more attention than usual on rendering times to spot
an hang.

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