I have the same problem as Osmo Laitinen with the same platform.
Dell Latitude C610 laptop with Radeon Mobility M6 LY [Radeon Mobility
9000].
Ubuntu Dapper freezing randomly, and the only way to escape is to take
out the battery and power off.
I never had these problems in Breezy, which I used all the time on this
laptop. Windows also doesn't have this problem, so it can't be
hardware.
There is no information in the /var/log files either.
It is really frustrating, and makes the whole experience unusable as I
keep losing work. I'll try to turn off some of the ati features as
suggested here or use the vesa driver.
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system freeze when using ati radeon 7000 with xorg "ati" driver
https://launchpad.net/bugs/16873
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