[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 #88 from afran at gmx.net ---
The problem not only affects X output (and the described xrandr symptoms), but
also happens when booting with framebuffer support: on my Thinkpad T440p, boot
halts entirely as soon the framebuffer switches to the higher resolution. Boot
only resumes when I lift the laptop momentarily from the docking station (with
DisplayPort monitor connected to it). Boot halts next when the console font is
switched; same process: it can only be resumed when I lift the laptop from the
docking station.

I can easily reproduce this behavior with the latest (2013.09) Grml live linux
system (http://grml.org/download/).

Please let me know what further information I can provide to help solve this.

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