@Christopher: without the workaround given in comment #7 I had this problem with the development version of Saucy.
Now, I'm using Trusty and I have kernel oops (due to the Radeon module) when using the kernel 3.12 (I have to report a new bug...) ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1170917 Title: Powering down inactive GPU while running X causes NULL pointer dereference To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1170917/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs