** Summary changed:

- [ati radeon rv280] Screen displays horizontal streaking, mouse cursor normal 
with AGPx8; worked okay with Feisty
+ Blank screen or distorted image because of wrong default AGPMode value

** Description changed:

  Binary package hint: xserver-xorg-video-ati
  
  Since the updates a few days ago on gutsy, my screen shows horizontal tearing 
streaks with only the mouse pointer shown normally (see 
http://launchpadlibrarian.net/9255354/00001.jpg). This is on a radeon 9250.
  Usplash is displayed normally, gdm and gnome are scrambled.
  
  This problem was first seen on Gutsy with the upload of the
  1:6.6.193-1ubuntu1 ati driver, and worked fine on Feisty and Breezy.
  Downgrading xserver-xorg-video-ati to feisty's 1:6.6.3-2ubuntu6 fixes
  the problem for me, so the problem must be in the changes between that
  version and 1:6.6.193-1ubuntu1.
  
  [Workaround]
  Disable 3D (including Desktop Effects) by adding this to your Modules section:
  
  Section "Module"
          ...
          Disable "dri"
  EndSection
  
  If the above does not fix the issue for you, then you are not seeing
  this particular bug, and should report it separately.
+ 
+ UPDATE:
+ 
+ Try setting 'Option "AGPMode" "4"' to the Device section.

** Tags removed: iso-testing

-- 
Blank screen or distorted image because of wrong default AGPMode value
https://bugs.launchpad.net/bugs/133192
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