The problem seems related to the way ubuntu hibernation work. The problem disappeared after installing "tux on ice" version of kernel suspend to disk implementation (using version at ppa:tuxonice/ppa):
$> uname -r -v 2.6.32-22-generic-tuxonice #36~ppa2-Ubuntu SMP Sat Jun 5 02:21:24 UTC 2010 -- Unexpected power-off during boot or when resuming from suspend https://bugs.launchpad.net/bugs/588194 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
