I finally found out what happens when the system hangs, using netconsole. I get this error message twice before the system dies: ata1: command 0x25 timeout, stat 0x50 host_stat 0x4 It seems to happen faster when I work under X, then it is reproducible, I open Thunderbird, type my password and it hangs. With the console I've had uptimes of some hours, it's harder to trigger it. The problem is also described here [1], although it's not exactly the same. Find attached the kernel.log for that session. Eduardo. PS: As Ben suggested I added an entry for PowerMac8,2 in arch/ppc64/kernel/pmac_feature.c. [1] http://bugzilla.ubuntu.com/show_bug.cgi?id=12904
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