** Description changed:

  Binary package hint: xserver-xorg-video-ati
  
  My computer is a Fujitsu/Siemens Laptop Lifebook E series with ATI
  Technologies Inc Radeon Mobility X1400.
  
  I'm using the xserver-xorg-video-ati open source driver.
  
  The native resolution of the screen is 1680x1050 (16:10) and it's
  working great except when you unplug a beamer.
  
  Steps to reproduce :
  
  1) Have your screen in its native 1680x1050 resolution (16:10)
  2) Hotplug a beamer. It will be detected as a screen in 
gnome-display-properties
  3) Most beamer doesn't support such a high resolution (or requires a 4:3 
ratio) and will stay black. With gnome-display-properties, lower your 
resolution (for example at 1024x768)
  4) Do your presentation
  5) Unplug the beamer. It will disapear from gnome-display-properties
  6) Try to reset your resolution : 1680x1050 has disappeared. All other 
resolution up to 1600x1024 are available. Only this one is not.
  
  Workaround : restarting X (by logging out) is enough. GDM will
  automatically have the good resolution.
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML 
and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
+       Subsystem: Fujitsu Limited. Device [10cf:1378]
+ 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon 
Mobility X1400 [1002:7145]
+       Subsystem: Fujitsu Limited. Device [10cf:139e]

-- 
[R500 x1400] 1680x1050 resolution not available anymore after unpluging a beamer
https://bugs.launchpad.net/bugs/329071
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