I have also this problem on feisty (herd cd 3, linux- image-2.6.20-6-generic) on a laptop Toshiba P100-284. I have to apply a custom DSDT because sound doesn't work (apparently as all P100 family) and the DSDT.aml has no effect on a reconfigure.
-- feisty kernel 2.6.20-6-generic does not contain DSDT patch as dapper and edgy did https://launchpad.net/bugs/83544 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs