[Bug 355508] [NEW] corrupt login screen and lockup during login when using desktop effects

[Peter T Hayward]

Public bug reported:

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.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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