Public bug reported: Recently upgraded from 10.10 to 12.04. After an idle period where the backlight correctly turns off the backlight of my Toshiba L-300-D laptop the backlight comes on but when I move the mouse or press a key however the screen remains dimmed (grayed out) and stays that way for up to a minute before the screen reappears. To ensure fan control works I boot with " acpi_osi= " in the linux grub line. The screen used to immediately undim and let me see the screen.
lsb_release -rd Description: Ubuntu 12.04 LTS Release: 12.04 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 UTC 2012 i686 athlon i386 GNU/Linux ** Affects: acpi (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/996937 Title: Laptop screen remains dimmed after idle To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/acpi/+bug/996937/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs