[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 #138 from Jean-Marc Valin <jmvalin at jmvalin.ca> ---
I have a W540 that also freezes when trying to use DP, with the difference that
I don't see any oops or error message in neither the kernel logs, nor the X
logs. When I plug in an external monitor, xranrd shows it as connected to DP2,
regardless of whether it's connected to DP1, DP2, DVI or HDMI. On one occasion,
I have been able to get a mirror output on both DP1 and DP2 (still after 1-2
min of freezing), even though xrandr still showed only DP2 as being connected.
I have been unable to reproduce that partial success since. During the freeze,
Xorg keeps using a steady 20% CPU, but any attempt at attaching gdb to the Xorg
process only resulted in gdb feezing (had to kill -9 it). Anything I can run to
help debugging this?

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