A solution for this problem that works for me (ubuntu 10.10, 2.6.35-24 kernel) is described here http://ubuntuforums.org/showthread.php?t=1612560
In a nutshell, add the kernel option "acpi_osi=" to grub, by executing $ gksudo gedit /etc/default/grub (which calls an editor) to replace in the file /etc/default/grub the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" with GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" Then execute $ sudo update-grub and reboot. Backlight-changing should now work seamlessly. Axel -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/588983 Title: Kernel backlight driver does not physically change the light level -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
