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Date:	Tue, 14 Nov 2006 22:00:49 +0100
From:	Andreas Mohr <andi@...x01.fht-esslingen.de>
To:	Andreas Mohr <andi@...x01.fht-esslingen.de>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
Subject: Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

Hi,

On Tue, Nov 14, 2006 at 09:30:17PM +0100, Andreas Mohr wrote:
> There's also some register description about APIC timer,
> maybe I'll gather something about my C2 headaches from there.

OK, offset 0x8C Host Bus Power Management Control has
(VT8235, but 8237 is same I think):
bit 0 Internal Clock Stop During Suspend (default 0)
bit 1 Internal Clock Stop During C3 (default 0) [internal PCI clock]
bit 2 Internal Clock Stop for PCI Idle (default 0)
[stop PCI clock when PCKRUN# high]

This wouldn't have anything whatsoever to do with my ACPI ""C2""
BIOS headaches, I assume??

Probably my BIOS has some of those bits tweaked to 1,
need to fiddle with pciutils a bit...

Somehow I'm getting the impression that we should have been
rewarding the BIOS with indifference all the time already in Linux,
given how *very useful* those chipset registers are...
Argh.

Burn ACPI, EFI, Real Mode, ..., let's go back to basics. :-P

Andreas Mohr
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