linux-kernel - Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4})

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Date:	Mon, 19 Mar 2007 20:49:53 +0100
From:	"Stefan Prechtel" <stefan.prechtel@...glemail.com>
To:	tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	"Len Brown" <lenb@...nel.org>, "Andi Kleen" <ak@...e.de>,
	"john stultz" <johnstul@...ibm.com>
Subject: Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4})

2007/3/19, Thomas Gleixner <tglx@...utronix.de>:
> 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

Here is the output of /proc/interrupts on 2.6.20:
           CPU0       CPU1
  0:       7089          0  local-APIC-edge-fasteio   timer
....
and this on 2.6.21-rc*:
           CPU0       CPU1
  0:        255          0  local-APIC-edge-fasteoi   timer
....

on 2.6.21-rc* the number "255" doesn't change.

But if it is ACPI relevant, shouldn't it boot with acpi=off?
I've tried with acpi=off and noapic but only with nolapic it started.

And the content of /proc/acpi/processor/C000/power shows only one
c-state; shouldn't it show more C-states? (please correct me if I'm
wrong)

 # cat /proc/acpi/processor/C000/power
active state:            C1
max_cstate:              C8
bus master activity:     00000000
maximum allowed latency: 2000 usec
states:
   *C1:                  type[C1] promotion[--] demotion[--]
latency[000] usage[00000000] duration[00000000000000000000]


Regards,
Stefan Prechtel
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