Re: [ [PATCH] Powernow-k8 buggy BIOS override for 2.6.6]

From: Tony Lindgren
Date: Thu May 13 2004 - 10:35:25 EST

* Dave Jones <davej@xxxxxxxxxx> [040513 07:06]:
> On Wed, May 12, 2004 at 05:16:28PM -0700, Tony Lindgren wrote:
> > Following is the updated patch to make the powernow-k8 driver work on
> > machines with buggy BIOS, such as emachines m6805.
> >
> > The patch overrides the PST table only if check_pst_table() fails.
> >
> > The minimum value for the override is 800MHz, which is the lowest value
> > on all x86_64 systems AFAIK. The max value is the current running value.
> >
> > This patch should be safe to apply, even if Pavel's ACPI table check is
> > added to the driver. Or does anybody see a problem with it?
> Does the ACPI fallback not do the right thing ?

Does not work for me. But looks like that's because I had to turn off
ACPI processor module since 2.6.6 since it would hang my system. It could
also be that the hang is caused by the powernow-k8. I will check that.

> I don't really see the point of limping along with a 2-state PST
> if we can derive the proper info from the ACPI table.

Sure if the ACPI table check works properly. But even with 2-state PST,
being able to change from 1800MHz to 800MHz on battery increases the
battery life quite a bit. And it does not necessarily require ACPI :)


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