[Bug 94766] Segfault and other crashes on Intel(R) HD Graphics 5500 (Dell E7450) while switching between external displays and integreated

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94766

--- Comment #10 from Slawomir Gonet <slawek at otwiera.cz> ---
I am testing git-sources 4.6-rc6 now (without patches):
$ eix git-sources -c
[I] sys-kernel/git-sources (4.6_rc6(4.6_rc6)@05/05/2016): The very latest -git
version of the Linux kernel

And after plugging back into dock station few minutes ago I've got image on
only one display. In dmesg:
[30395.435686] [drm:intel_mst_disable_dp] *ERROR* failed to update payload -22
[30397.855938] [drm:intel_mst_disable_dp] *ERROR* failed to update payload -22
[30602.873944] [drm:intel_mst_disable_dp] *ERROR* failed to update payload -22
[30605.136058] [drm:intel_mst_disable_dp] *ERROR* failed to update payload -22
[30647.465280] [drm:intel_mst_disable_dp] *ERROR* failed to update payload -22

xrandr:
$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  48.00  
   1400x1050     59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
DP1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 531mm x 299mm
   1920x1080     60.00*+
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1280x720      60.00  
   1152x720      59.97  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DP1-2 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  60.00    50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1152x720      59.97  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP1-3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

And when try to use xrandr:
otwieracz at odyssey ~ $ xrandr --output DP1-1 --auto --primary
# Here is OK
otwieracz at odyssey ~ $ xrandr --output DP1-2 --auto --left-of DP1-1
xrandr: Configure crtc 0 failed
# And now *right* screen goes off for few seconds, then comes back again and I
see this error message with crtc.

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