[Bug 71267] sna: (Haswell) X-server freezes when enabling DP at docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71267

--- Comment #6 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #4)
> Created attachment 88700 [details]
> dmesg 3.11.6 (drm.debug=0xe)

There seems to be nothing terrible going wrong leading up to the backtrace. So
looks like a new kind of bug. Can you please recompile with lockdep
(CONFIG_PROVE_LOCKING) enabled and regrab a drm.debug dmesg of the hang? That
should list all the other task hogging the mutex and hopefully shed more light
onto what's going wrong here.

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