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[Launchpad Bug Tracker <544741@xxxxxxxxxxxxxxxxxx>]

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Binary package hint: xserver-xorg-driver-ati

arch: amd64
hardware: radeon mobility x700
version: lucid beta1

linux-image-2.6.32-16-generic (2.6.32-16.25)
xserver-xorg-video-ati (1:6.12.191-1ubuntu2)

kms, by default in lucid beta1 is on. system boots flawlessly. after
logged in feels sluggish. tried to turn off effects by navigating to
system > preferences > appearance and immediately system reboots or
freezes (tried multiple times - all with success).

turning kms of (radeon.modeset=0) - no more crashes.

I believe, this is release critical: radeon.modeset=1 not ready for the
prime (not the default), or some models need to be blacklisted...

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
kms, x700 mobility, amd64, lucid beta1: reboot or freeze while trying to launch system > preferences > appearance
https://bugs.edge.launchpad.net/bugs/544741
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