Bug#798811: x11-xserver-utils xrandr: shows display in connected state after disconnecting it with --off option

["S. R. Wright" <srw6666@gmail.com>]

Package: x11-xserver-utils
Version: 7.7+5


Kernel: 4.2.0
Arch: amd64


The xrandr query command shows a display that had been disconnected with:

xrandr --output LVDS-1  --off

as still being connected.  My host has an LCD display (LVDS-1) and an 
external monitor (VGA-1).  Starting with both connected:


> xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS-1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 
345mm x 194mm
   1600x900      59.98*+
   1152x864      59.96
   1024x768      59.92
   800x600       59.86
   640x480       59.38
   720x400       59.55
   640x400       59.95
   640x350       59.77
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 disconnected (normal left inverted right x axis y axis)
VGA-1 connected primary 1920x1080+0+0 (normal left inverted right x axis 
y axis) 510mm x 287mm
   1920x1080     60.00*+
   1680x1050     59.95
   1280x1024     60.02
   1440x900      59.89
   1280x720      60.00
   1024x768      60.00
   800x600       60.32
   640x480       60.00
   720x400       70.08

Both displays are active and mirroring.  After running "xrandr --output 
LVDS-1  --off"  the LCD goes dark and the output now is:

> xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS-1 connected (normal left inverted right x axis y axis)


   1600x900      59.98 +
   1152x864      59.96
   1024x768      59.92
   800x600       59.86
   640x480       59.38
   720x400       59.55
   640x400       59.95
   640x350       59.77
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 disconnected (normal left inverted right x axis y axis)
VGA-1 connected primary 1920x1080+0+0 (normal left inverted right x axis 
y axis) 510mm x 287mm
   1920x1080     60.00*+
   1680x1050     59.95
   1280x1024     60.02
   1440x900      59.89
   1280x720      60.00
   1024x768      60.00
   800x600       60.32
   640x480       60.00
   720x400       70.08

However it still indicates that LVDS-1 is "connected" and some apps I 
have tried (notably qiv, vlc and virtualbox guests) seem confused and 
believe fullscreen is still 1600x900 and NOT 1920x1080.

This may be pilot error,  but I would have suspected that LVDS-1 should 
be "disconnected" and that apps should be completely unaware of its 
existence and not use its res as fullscreen.