Messages in this thread | | | Subject | Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4}) | From | Thomas Gleixner <> | Date | Mon, 19 Mar 2007 20:27:56 +0100 |
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Stefan,
On Mon, 2007-03-19 at 19:53 +0100, Stefan Prechtel wrote: > You can find the files here: > http://bugzilla.kernel.org/show_bug.cgi?id=8235
thanks for providing the data. Your ACPI tables don't provide information about the power states (C-States), but your BIOS seems to switch the CPUs into deeper power states, when it runs on battery. In those deeper power states the local APIC timers and the TSC are stopped. So the machine waits for ever on the next timer interrupt.
We have a broadcast mechanism for this, which gets activated from ACPI, but the broadcast mechanism is not activated:
[ 3.798000] Clock Event Device: pit .... [ 3.798000] tick_broadcast_mask: 00000000
Can you please boot with 2.6.20 or earlier and check the output of /proc/interrupts ?
IRQ#0 and the LOC (local APIC timer) Interrupts should increment in the same frequency.
tglx
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