[Nouveau] [Bug 77674] [NVE7] "failed to read DPCD" on wake up with external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77674

--- Comment #4 from jason leroy <jsnlry at gmail.com> ---
I am experiencing the same issue on ArchLinux. My Hardware:

 * HP EliteBook 8440p
 * VGA compatible controller: NVIDIA Corporation GT218M [NVS 3100M]

Installed software:

 * ArchLinux with all available updates
 * Kernel 3.15.1-1-ARCH
 * nouveau-dri 10.2.1-2
 * xf86-video-nouveau 1.0.10-2
 * lib32-nouveau-dri 10.2.1-3

My Log shows the following for nouveau when I suspend/resume the system:

nouveau  [     DRM] suspending display...
nouveau  [     DRM] unpinning framebuffer(s)...
nouveau  [     DRM] evicting buffers...
nouveau  [     DRM] waiting for kernel channels to go idle...
nouveau  [     DRM] suspending client object trees...
nouveau  [     DRM] suspending kernel object tree...
nouveau  [     DRM] re-enabling device...
nouveau  [     DRM] resuming kernel object tree...
nouveau  [   VBIOS][0000:01:00.0] running init tables
nouveau  [    VOLT][0000:01:00.0] GPU voltage: 850000uv
nouveau  [  PTHERM][0000:01:00.0] fan management: automatic
nouveau  [     CLK][0000:01:00.0] --: core 405 MHz shader 810 MHz memory 405
MHz
nouveau  [     DRM] resuming client object trees...
nouveau  [     DRM] resuming display...
nouveau E[   PDISP][0000:01:00.0] DP:0006:0344: failed to read DPCD
nouveau E[   PDISP][0000:01:00.0] DP:0006:0344: link training failed

In my case there is NO external display and also NO docking station. It's the
display of the laptop that remains black.

For me, long-pressing the power button is the only way out of this situation.

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