For me the opposite has happened; Before I was getting a laggy Gnome brightness indicator but no brightness changes happening.
Then I added 'options thinkpad_acpi brightness_enable=1' to /etc/modprobe.d/options and now I'm getting a non laggy Gnome brightness indicator but still no brightness changes actually taking place. -- [REGRESSION] Impossible to change LCD brightness on Thinkpad R61/T61/X61 https://bugs.launchpad.net/bugs/198476 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