I am having a similar lockup problem (see https://bugs.freedesktop.org/show_bug.cgi?id=21849). Can you try reverting to original Ubuntu packages and installing kernel 2.6.29.3 from # KernelMainlineBuilds PPA [0] and see if that fixes your lockup as with me?
I am bisecting between 2.6.29 and 2.6.30-rc1 right now.
I am having a similar lockup problem (see https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 21849). Can you try reverting to original Ubuntu packages and installing kernel 2.6.29.3 from # KernelMainlineB uilds PPA [0] and see if that fixes your lockup as with me?
I am bisecting between 2.6.29 and 2.6.30-rc1 right now.
[0] https:/ /wiki.ubuntu. com/KernelMainl ineBuilds