I seem to have a similar problem on my ThinkPad X31. I installed Dapper (kernel 2.6.15-26) about 2 weeks ago and everything worked well except after suspending to ram, I/O error would occur with one of the mounted HD partitions, and rebooting would cause the system to hang completely with the HD light illuminated - all I could do at that point was turn off the power. Disabling laptop-mode by setting ENABLE_LAPTOP_MODE="no" in /etc/default/laptop-mode hasn't solved the problem.
-- laptop-mode/IDE-APM hang on various laptops https://launchpad.net/bugs/12483 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
