[Bug 99841] New: Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

            Bug ID: 99841
           Summary: Switching to VT freezes X only on a dual screen
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: riesebie-xZYEWGoilGM@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 129683
  --> https://bugs.freedesktop.org/attachment.cgi?id=129683&action=edit
Config-4.10.0-rc8

Kernel Graphic Driver: nouveau
Dual Screen: Yes
After switching to VT via "<ctrl> <alt> FN" or "chvt N" X freezes. No keyboard
response, no pointer response.

Booting with only one screen VT-switch works as expected. Running 4.9.? runs
fine, though. Doesn't matter whether I use libinput or evdev. I don't found
meaningful logs other than the last lines in

Xorg.0.log:
  [    49.408] (II) AIGLX: Suspending AIGLX clients for VT switch¬
  [    49.408] (II) NOUVEAU(0): NVLeaveVT is called.¬
  [    54.592] (II) UnloadModule: "libinput"¬
  [    54.598] (II) UnloadModule: "libinput"¬
  [    54.598] (II) UnloadModule: "libinput"¬
  [    54.598] (II) UnloadModule: "libinput" 

xrandr:
Screen 0: minimum 320 x 200, current 3520 x 1200, maximum 16384 x 16384
DVI-I-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y
axis) 518mm x 324mm
   1920x1200     59.95*+
   1920x1080     60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     60.02  
   1440x900      59.90  
   1280x960      60.00  
   1280x800      59.91  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
DVI-D-1 connected 1600x1200+1920+0 (normal left inverted right x axis y axis)
408mm x 306mm
   1600x1200     60.00*+
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)

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