I guarantee it does not depend on the kernel version. If install new kernel in 13.04 (for example 3.13), the bug does not appear. I think in backlight control (in gnome-system-settings) can be added switcher to video outputs As Notebook screen and VGA, HDMI external output and other. This fix, can avoid this problem.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1249219 Title: backlight control acpi_video0 instead intel_backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1249219/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
