Same problem on VGN-SZ140P and VGN-T150P and sound does work fine on the VGN-SZ140P. I was able to fix it doing the modprobe sony_acpi as listed above. Using kernel 2.6.20-9-generic
-- Screen brightness keys don't work on Sony VAIO VGN-S260 laptop (Feisty) https://launchpad.net/bugs/75019 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
