1. Connect a secondary monitor via HDMI
2. *Slowly* unplug the HDMI cable
3. Observe that there is no output retraining.  The mouse can still be moved to the now unplugged external monitor.


Looking at the output of "cat /sys/class/drm/*/status" shows that the kernel has the correct view of the current connection states.  In the output below the states represent the three connections on the video card.

card0-DVI-I-1
card0-DVI-I-2
card0-HDMI-A-1

## Before plugging in monitor

$ cat /sys/class/drm/*/status
disconnected
connected
disconnected

## After plugging in monitor

$ cat /sys/class/drm/*/status
disconnected
connected
connected

## After slowly unplugging in monitor

$ cat /sys/class/drm/*/status
disconnected
connected
disconnected


The output from xrandr shows the correct states when the secondary monitor is connected.


$ xrandr
Screen 0: minimum 320 x 200, current 4480 x 1600, maximum 8192 x 8192
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 646mm x 406mm
   2560x1600      59.9* 
   1280x800       59.9  
HDMI-1 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080      60.0*+   50.0     59.9     60.0  
   1920x1080i     60.1     50.0     60.0  
   1600x1200      60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1440x900       59.9  
   1280x960       60.0  
   1366x768       59.8  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        75.0     72.8     66.7     60.0     59.9  
   720x400        70.1  


After the cable is slowly unplugged, xrandr shows the monitor as disconnected, but still shows and idea of the last resolution.

** Also, running xrandr at this point kicks the system to retrain the output **



$ xrandr
Screen 0: minimum 320 x 200, current 4480 x 1600, maximum 8192 x 8192
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 646mm x 406mm
   2560x1600      59.9* 
   1280x800       59.9  
HDMI-1 disconnected (normal left inverted right x axis y axis)
  1920x1080 (0x481)  148.5MHz
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
        v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz


Running xrandr once more shows the expected state of the system.


$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1600, maximum 8192 x 8192
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 646mm x 406mm
   2560x1600      59.9* 
   1280x800       59.9  
HDMI-1 disconnected (normal left inverted right x axis y axis)



This problem reproduces on several platforms using various kernels and video cards.  Here are two examples:

- Arch linux, intel graphics (i915), 3.13 kernel
- Linux Mint 13.10, nVidia (nouveau) graphics, 3.11 kernel

This problem does not happen when the cable is disconnected quickly.