[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 #110 from Theodore Ts'o <tytso at mit.edu> ---
I tried applying the patch ([PATCH]HDMI connection via dock works with some
(random) delay: https://bugs.freedesktop.org/attachment.cgi?id=93653) against a
3.13 kernel, and it makes things **worse** on my T540p.   With the 3.13 kernel
w/o the patch, I can boot and start up the X server w/o problems, as long as it
is not docked.  With this patch, the system locks up very early in the boot
process, as soon as the console switches from the compat VGA mode into the
higher resolution console mode).

Also, when comparing an unpatched 3.12 kernel with an unpatched 3.13 kernel,
3.13 is also worse with the T540p.  With the unpatched 3.12 kernel, I can have
the laptop in the dock, and so long as there are no external monditors hooked
up via the dock video connectors, it worked fine.   With the unpatched 3.13
kernel, it's fine outside of the dock, but if it is in the dock, even if the
dock does not have any external video monitors hooked up, any time there is any
change to the video setup (i.e., X server starts up, DPMS puts the monitor to
sleep, etc.) the system will lock up.  It will recover after I eject the laptop
from the dock, and after that point I can redock it, but while the system is
locked up, the laptop heats up and the fan starts up --- which I suspect means
that we are indeed hanging in some spinlock.

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