I am having the same problem except I am using the open source radeon driver.
enabling pm_trace yielded this result: [ 0.601249] Magic number: 0:523:740 [ 0.601295] hash matches /build/buildd/linux-2.6.32/drivers/base/power/main.c:471
Distributor ID: Ubuntu Description: Ubuntu lucid (development branch) Release: 10.04 Codename: lucid
I am having the same problem except I am using the open source radeon driver.
enabling pm_trace yielded this result: buildd/ linux-2. 6.32/drivers/ base/power/ main.c: 471
[ 0.601249] Magic number: 0:523:740
[ 0.601295] hash matches /build/
Distributor ID: Ubuntu
Description: Ubuntu lucid (development branch)
Release: 10.04
Codename: lucid