So it looks like the regression was introduced in v3.3. Can you test the following kernels and report back? We are looking for the earliest kernel version that has this bug:
v3.3-rc4: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc4-precise If v3.3-rc4 exhibits the bug then test v3.3-rc6: v3.3-rc6: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc6-precise If v3.3-rc4 does not exhibit the bug then test v3.3-rc2: v3.3-rc2: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc2-precise -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1107150 Title: B75 Chipset I/O Problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1107150/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
