There is a working patch on the URL specified to solve a bug in the kernel occuring on some HP computers (mine included). The patch works for me...
I can confirm that the mentioned patch http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=81d4af1340badcd2100c84fbd1bfd13156de41aa;hp=ae11be6f37dfa140b6c2d1a53b307ef57da69a04 fixes the problem on a HP/Compaq nc6120 notebook. Console logs for gentoo-sources-2.6.13 are attached.
Created attachment 68081 [details] Console log for unpatched 2.6.13
Created attachment 68082 [details] Console log for 2.6.13 with patch applied
The issue appears to be fixed in 2.6.13.1 which includes this patch.
Fixed in genpatches-2.6.13-2 Fixed in gentoo-sources-2.6.13-r1