I just tested on a mainline kernel from https://wiki.ubuntu.com/Kernel/MainlineBuilds using v2.6.32.21.9-lucid/ and the problem does not occur so the problem is in the ubuntu fixes it seems
I just tested on a mainline kernel from https:/ /wiki.ubuntu. com/Kernel/ MainlineBuilds using v2.6.32.21.9-lucid/ and the problem does not occur so the problem is in the ubuntu fixes it seems