I reinstalled Raring from a daily build in the hope that might fix things. It didn't: booting still usually, but not always, fails. To recap what I've said above, when I boot one of three things typically happens:
1. I'm left looking at a black screen with a mouse cursor on virtual terminal 7. No process has crashed. 2. The X server crashes, and the log file shows "no devices found"/"no screens found" errors. 3. The boot succeeds. I compared the X server log in case 1 with the log after a successful boot and saw an interesting difference. In case 1, the log contains this: [ 7.479] (II) intel(0): SNA initialized with no backend [ 7.479] (==) intel(0): Backing store disabled [ 7.479] (==) intel(0): Silken mouse enabled [ 7.479] (II) intel(0): HW Cursor enabled [ 7.479] (II) intel(0): RandR 1.2 enabled, ignore the following RandR disabled message. [ 7.479] (==) intel(0): DPMS enabled [ 7.480] (WW) intel(0): Textured video not supported on this hardware For a successful boot, the corresponding lines look like this: [ 7.404] (II) intel(0): SNA initialized with IvyBridge backend [ 7.404] (==) intel(0): Backing store disabled [ 7.405] (==) intel(0): Silken mouse enabled [ 7.405] (II) intel(0): HW Cursor enabled [ 7.405] (II) intel(0): RandR 1.2 enabled, ignore the following RandR disabled message. [ 7.405] (==) intel(0): DPMS enabled -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1161371 Title: X server sometimes fails to start on MacBook Air 5,2: no screens found To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1161371/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
