I also encounter this issue on my dell xps 15. This bug happens for me with kernel 3.5.0-18-generic, but not with 3.5.0-17-generic.
When booting with 3.5.0-18-generic, driver initialization fail, and X fallback to using the vesa driver. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1070690 Title: BUG: unable to handle kernel NULL pointer dereference at (null); RIP: 0010:[<ffffffff8167f93a>] [<ffffffff8167f93a>] __mutex_lock_slowpath+0xaa/0x150 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1070690/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
