[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 #115 from Theodore Ts'o <tytso at mit.edu> ---
I tried applying the two patches which you posted on intel-gfx[1], ported to
3.13.

[1] http://article.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/33737

Using a T540p and an Ultradock, connected to a Dell U2410 via a DisplayPort
cable --- and it worked!  Not only were there no hangs, but in fact I could
enable and disable the external display.  The "too many retries" did indeed
trigger:

[    4.152360] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit
banging on pin 5
...
[    4.245174] fbcon: inteldrmfb (fb0) is primary device
...
[    5.952436] [drm:intel_dp_aux_native_write] *ERROR* too many retries, giving
up
[    6.004766] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[    6.129836] Console: switching to colour frame buffer device 240x75
[    6.134854] i915 0000:00:02.0: fb0: inteldrmfb frame buffer 
[    6.134856] i915 0000:00:02.0: registered panic notifier
[    6.275753] ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
[    6.276089] input: Video Bus as
/devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input11
[    6.276620] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor
0
[    6.277149] snd_hda_intel 0000:00:03.0: irq 46 for MSI/MSI-Xdevice

When I tried disabling the external monitor, undocking, and redocking, and then
tried enabled the external monitor again, the too many retries did trigger
again:

[ 1066.879571] drm: not enough stolen space for compressed buffer (need
33554432 more bytes), disabling. Hint: you may be able to increase stolen
memory size in the BIOS to avoid this.
[ 1070.884851] [drm:intel_dp_aux_native_write] *ERROR* too many retries, giving
up

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