[Bug 85913] DP MST: kernel 3.17.1, strange xrandr crashes after docking haswell E7440

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85913

--- Comment #7 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
Happy to report things have improved nicely on .917 snapshot. After docking,
xrandr is now able to pump a picture to the 2560x1440 immediately, with no
delays and no crashing.

There's still a couple of scenarios where I can get the same xrandr hang and
crash reproduced though. It has to do with undocking-redocking cycles within a
single session, without suspending the machine inbetween. Since the usual
workflow is to just dock + work, then after undocking a suspend action for
travel, perhaps that clears some driver / MST / whatever states up, so after
waking later and redocking xrandr acts nice and fast again.

But things are definitely more comfortable to work with now, thanks a bunch CW

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