linux-kernel - [BUG] nouveau regression: ext monitor dead after resume

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Date:	Thu, 18 Sep 2014 16:07:51 +0200
From:	Ortwin Glück <odi@....ch>
To:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [BUG] nouveau regression: ext monitor dead after resume

Hi,

Since 3.16 an external monitor stays dark after resume from sleep. I didn't manage to activate it
again with xrand. According to xrandr it is "connected" and configured with a mode, but I get no signal.

Happens since 3.16 and is still broken with 3.17-rc5.

Hardware:
HP EliteBook 8540w
01:00.0 VGA compatible controller: NVIDIA Corporation GT215GLM [Quadro FX 1800M] (rev a2)
0

External Monitor connected via DVI on the docking station.

XRandR before amd after suspend looks the same:

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
   1920x1080      59.9*+   60.0
   1680x1050      60.0
   1400x1050      60.0
   1280x1024      59.9
   1280x960       59.9
   1152x864       60.0
   1024x768       59.9
   800x600        59.9
   640x480        59.4
   720x400        59.6
   640x400        60.0
   640x350        59.8
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
eDP-1 disconnected (normal left inverted right x axis y axis)
DP-3 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
   1920x1080      60.0*+
   1680x1050      59.9
   1280x1024      75.0     60.0
   1440x900       75.0     59.9
   1024x768       75.1     60.0
   800x600        75.0     60.3
   640x480        75.0     72.8     66.7     60.0
   720x400        70.1
VGA-1 disconnected (normal left inverted right x axis y axis)

dmesg output of a suspend/resume cycle attached.

View attachment "dmesg.txt" of type "text/plain" (75279 bytes)