[Intel-gfx] intel mst + club 3d csv5300 hub only in clone mode + xorg crashes

[stephan schultchen]

hey,

i have a dell xps 13 with an integrated intel adapter running on kubuntu
14.10, and a club3d csv5300 displayport hub with two attached dell displays.

i am currently using the 3.18 kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-vivid/

the problem is that the displays attached to the DP hub only work in clone
mode.

and whenever i disconnect, or reconnect a display to the hub XOrg is
crashing with a segfault.

connecting and disconnecting the hub itself works fine.

here are the last lines of the xorg log:

[   310.480] (II) intel(0): resizing framebuffer to 3840x1200
[   310.485] (II) intel(0): switch to mode 1920x1080 at 60.0 on eDP1 using
pipe 0, position (0, 0), rotation normal, reflection none
[   310.516] (II) intel(0): switch to mode 1920x1080 at 60.0 on DP1 using pipe
1, position (0, 0), rotation normal, reflection none
[   310.524] (II) intel(0): switch to mode 1920x1200 at 60.0 on DP1 using pipe
1, position (1920, 0), rotation normal, reflection none
[   323.675] (II) intel(0): resizing framebuffer to 1920x1080
[   323.679] (II) intel(0): switch to mode 1920x1080 at 60.0 on eDP1 using
pipe 0, position (0, 0), rotation normal, reflection none
[   324.282] (II) intel(0): switch to mode 1920x1200 at 60.0 on DP1 using pipe
1, position (1920, 0), rotation normal, reflection none
[   324.808] (II) intel(0): switch to mode 1920x1080 at 60.0 on eDP1 using
pipe 0, position (0, 0), rotation normal, reflection none
[   324.808] (II) intel(0): switch to mode 1920x1200 at 60.0 on DP1 using pipe
1, position (1920, 0), rotation normal, reflection none
[   324.816] (II) intel(0): switch to mode 1920x1080 at 60.0 on eDP1 using
pipe 0, position (0, 0), rotation normal, reflection none
[   324.816] (II) intel(0): switch to mode 1920x1200 at 60.0 on DP1 using pipe
1, position (1920, 0), rotation normal, reflection none
[   324.832] (EE)
[   324.832] (EE) Backtrace:
[   324.832] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7ff161614666]
[   324.832] (EE) 1: /usr/bin/X (0x7ff16145e000+0x1ba869) [0x7ff161618869]
[   324.832] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6
(0x7ff15f192000+0x36da0) [0x7ff15f1c8da0]
[   324.832] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7ff15b580000+0x69d85) [0x7ff15b5e9d85]
[   324.832] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7ff15b580000+0x10be22) [0x7ff15b68be22]
[   324.832] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7ff15b580000+0x6cb23) [0x7ff15b5ecb23]
[   324.832] (EE) 6: /usr/bin/X (WakeupHandler+0xaa) [0x7ff1614b9e2a]
[   324.832] (EE) 7: /usr/bin/X (WaitForSomething+0x1c7) [0x7ff161611a97]
[   324.832] (EE) 8: /usr/bin/X (0x7ff16145e000+0x56ec1) [0x7ff1614b4ec1]
[   324.832] (EE) 9: /usr/bin/X (0x7ff16145e000+0x5b2a6) [0x7ff1614b92a6]
[   324.832] (EE) 10: /lib/x86_64-linux-gnu/libc.so.6
(__libc_start_main+0xf5) [0x7ff15f1b3ec5]
[   324.832] (EE) 11: /usr/bin/X (0x7ff16145e000+0x456ae) [0x7ff1614a36ae]
[   324.832] (EE)
[   324.832] (EE) Segmentation fault at address 0x1e0
[   324.832] (EE)
Fatal server error:
[   324.832] (EE) Caught signal 11 (Segmentation fault). Server aborting
[   324.832] (EE)
[   324.832] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[   324.832] (EE) Please also check the log file at "/var/log/Xorg.0.log"
for additional information.
[   324.832] (EE)
[   324.832] (II) AIGLX: Suspending AIGLX clients for VT switch
[   326.124] (EE) Server terminated with error (1). Closing log file.
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