Comment 30 for bug 136469

@Luis

Gutsy seems to accept the patched DSDT in the initram. You can simply check this by running the patched version and do a cat /proc/acpi/dsdt > dsdt.dat, iasl -d dsdt.dat (which we all love ;-)
And of course the size of /boot/initrd.img-2.6.22-... changes

I switched back to the feisty kernel 2.6.20-16-generic as recommended before.

Better hardware support should be way more important to Ubuntu. The distro can be easiest-to-use and shiny as gold, but no one would use it if it runs just crippled (or perform serious hacks as we all did - no greenhorn can do this, and me don't want it)