Enabling nmi_watchdog solved this temp. add /etc/rc.local echo 0 >/proc/sys/kernel/nmi_watchdog
>From comment #89 of bug 1007765 it seems that fix will be in 3.10 ..hope so. Cheers. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/987630 Title: changing brightness freezes computer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/987630/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs