[Bug 101462] External monitor shows no signal after unplugging and plugging the cable back into dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101462

--- Comment #1 from Ethan Hsieh <ethan.hsieh at canonical.com> ---
Created attachment 131994
  --> https://bugs.freedesktop.org/attachment.cgi?id=131994&action=edit
Xorg.0.log (compile xserver-xorg-video-intel with --enable-debug=full)

After compiling xserver-xorg-video-intel with --enable-debug=full, I got the
following error messgaes.
X restarted after I plugged the cable back into the dock. 

log_0615-3-enable_x_debug/Xorg.0.log.old:
[   105.305] (EE) Backtrace:
[   105.306] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x561c931aaade]
[   105.306] (EE) 1: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fc6bc498000+0xc21d9) [0x7fc6bc55a1d9]
[   105.306] (EE) 2: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fc6bc498000+0xc33e7) [0x7fc6bc55b3e7]
[   105.306] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fc6bc498000+0xd4607) [0x7fc6bc56c607]
[   105.306] (EE) 4: /usr/lib/xorg/Xorg (xf86Wakeup+0x197) [0x561c9308d557]
[   105.306] (EE) 5: /usr/lib/xorg/Xorg (WakeupHandler+0x6d) [0x561c9305095d]
[   105.306] (EE) 6: /usr/lib/xorg/Xorg (WaitForSomething+0x1ef)
[0x561c931a781f]
[   105.306] (EE) 7: /usr/lib/xorg/Xorg (0x561c92ff8000+0x53b8e)
[0x561c9304bb8e]
[   105.307] (EE) 8: /usr/lib/xorg/Xorg (0x561c92ff8000+0x57dd3)
[0x561c9304fdd3]
[   105.307] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0)
[0x7fc6c0425830]
[   105.307] (EE) 10: /usr/lib/xorg/Xorg (_start+0x29) [0x561c9303a049]
Fatal server error:
[   105.307] (EE) sna_output_add:4850 assertion 'to_sna_output(output)->id ==
0' failed

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