Have you tried a mainline kernel as described at the https://wiki.ubuntu.com/KernelTeam/MainlineBuilds page? I installed 2.6.34 on a T42 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-lucid/ and it solved the issue described in bug #427439. It may be worth a try.
Have you tried a mainline kernel as described at the https:/ /wiki.ubuntu. com/KernelTeam/ MainlineBuilds page? I installed 2.6.34 on a T42 from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v2.6.34- lucid/ and it solved the issue described in bug #427439. It may be worth a try.