Latest working kernel version: n/a Earliest failing kernel version: 2.6.28-rc8 (first tested version) Distribution: debian/unstable (part experimental) Hardware Environment: macbook 5,1 (13.3" unibody) When asked to reboot, my macbook hangs somewhere after the kernel prints "restarting system" and beeps, like this: <beep> <beep> <beep> <pause> <repeat> The system shuts down just fine. dmidecode and similar information is linked from http://johannes.sipsolutions.net/MacBook