Thanks for the tip Prakash - I can also confirm the brightness keys now work on my Lenovo G530 with kms enabled using 2.6.34-020634rc6-generic from kernel-ppa. It incorporates the previously mentioned patch from the kernel bugzilla:
Zhang Rui (1): drm/i915: set DIDL using the ACPI video output device _ADR method return. -- [Karmic & Lucid Beta 1] Brightness fn keys lost functionality (Lenovo laptops) https://bugs.launchpad.net/bugs/406515 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