** Description changed:

  Binary package hint: xserver-xorg-video-ati
  
  setting radeon.modeset=1 makes the X session unloadable
  i've tried it with EXA and XAA accelmethods, on 16 and 24 bits
  XAA seems making no difference (actually it seems in the log that EXA is used 
whether I set XAA or not)
  so here are the symptoms:
  
  e...@24 bits:
  loading and splash seems fine, but upon the X session start (i use autoload) 
i can only see the panel loaded, and after a few secs i'm dropped back to the 
login screen. i can switch to VT. colours and size are normal both in login 
screen and VT.
  
  e...@16 bits:
  loading and splash seems fine, but on X session start, i can see my 
background and the auto-starting apps 4 times tiled on the screen, and 
everything is dimmed and greenish, except for the mouse pointer. after a few 
secs i'm dropped back to login screen. it's tiled on the screen 4 times, and 
dimmed green too. the vt's size is normal, but it's also green
  
  attached some logs that might be useful
  
  driver version is
  xserver-xorg-video-radeon 1:6.12.99+git20090929.7968e1fb-0ubuntu1
+ 
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation 82830 830 Chipset Host Bridge 
[8086:3575] (rev 02)
+       Subsystem: IBM Device [1014:021d]
+ 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon 
Mobility M6 LY [1002:4c59]
+       Subsystem: IBM Device [1014:0239]

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[M6-LY] radeon kms doesn't work - returns to login screen
https://bugs.launchpad.net/bugs/478493
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