My ThinkPad X32 experiences random lockups as well after upgrading to
dapper. Apparantly, it is caused by xserver-xorg-driver-ati, because
lockups no longer occur after switching to the vesa driver.
--------
Section "Device"
Identifier "ATI Technologies, Inc. Radeon Mobility 9000 (M6 LY)"
Driver "vesa"
BusID "PCI:1:0:0"
EndSection
--------
I filed a bug report #55570 <https://launchpad.net/bugs/55570>.
--
dapper system freeze
https://launchpad.net/bugs/50687
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