[Bug 355508] Re: corrupt login screen and X freeze during login when using desktop effects

[Bryce Harrington]

** Description changed:

  System: Intel Mac Mini Core Solo, 2M RAM, 
  Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
  Software: Kubuntu 9.04 updated on 4 April 2009.
  
  I am using a xorg.conf containing Option "AccelMethod" "UXA" and no
  driver is specified.
  
  After the last (large) update, at login I get a corrupt screen that is
  divided into 5 vertical bands, each band containing hundreds of light
  and dark horizontal stripes in a cyclic pattern. The login window, and
  text, is visible behind this but has many dark spots where the rendering
  has failed. I can enter the login password but soon after that, when
  showing the last icon in the middle of the screen, X freezes, apart from
  mouse movement. No response from keyboard. Have to power down.
  
  I can get round this by switching to tty1 immediately after entering the
  password (so I don't see the icons on the foreground screen) then
  waiting until I hear the logon sounds. Then I know it is safe to switch
  to tty7 and view the graphics sceen. This is a repeatable workaround but
  obviously not ideal.
  
  I found that turning off desktop effects got rid of the problem
  completely.
  
  Also I tried regenerating xorg.conf using dpkg-reconfigure. This
  produced a vesa driver version of xorg.conf. This vesa version works
  without problem and there is no noticable difference in performance
  compared with the UXA version I was using before.
  
  This problem did not exist using desktop effects before the last update.
  
  Incidentally I tried using the ubuntu-bug command as printed below and
  all I got was a usage message. My command did conform to the usage
  message syntax but the command was not accepted.
+ 
+ [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: Intel Corporation Device [8086:7270]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
+     	Subsystem: Intel Corporation Device [8086:7270]

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corrupt login screen and X freeze during login when using desktop effects
https://bugs.launchpad.net/bugs/355508
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