I fixed this on a friends laptop by upgrading the BIOS. Apparently there is some incompatibility with the old version. Some details:
Laptop Model: Toshiba Satellite A105-S4254 Old BIOS: Version 2.00 New BIOS: Version 6.00 -- Fn Keys do not work on Toshiba a105-s4334 https://bugs.launchpad.net/bugs/81401 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