[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #190 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #189)
> Hi Chris,
> 
> OK, nothing of the above was the reason. In my case it's simply this:
> 
> /etc/X11/xorg.conf.d/20-intel.conf
> 
> Section "Device"
>    Identifier  "Intel Graphics"
>    Driver      "intel"
>    Option      "TearFree"    "true"
> EndSection
> 
> 
> I added it when the tearing scrolling through large webpages annoyed me.
> As soon as I added it, the problems quickly started.
> 
> Selfmade problem.

Not really, https://bugs.freedesktop.org/show_bug.cgi?id=70764 tracks that this
hang is more likely with TearFree (fundamentally the hang is still the same
hardware issue, but it is interesting that TearFree has a higher chance of
hitting it).

If you want to experiment:

 http://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=requests

should have an interesting fix, at least for trying to prevent the TearFree
leading to the semaphore hang.

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