I found something interesting that might help resolve this. I was updating my karmic on my T5810, and AIGLX somehow broke. So it came up without any hardware 3d acceleration at all, but the brightness applet and keys worked!
-- Screen brightness does not function on Acer Aspire Timeline 5810TZ https://bugs.launchpad.net/bugs/438537 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