From: "Rafał Bilski" <rafalbilski@interia.pl>
To: Dave Jones <davej@redhat.com>
Cc: cpufreq@lists.linux.org.uk
Subject: Re: [PATCH] Longhaul - Only for "Powersaver"
Date: Thu, 13 Jul 2006 08:59:24 +0200 [thread overview]
Message-ID: <44B5EF4C.1000906@interia.pl> (raw)
In-Reply-To: <20060713062723.GB12807@redhat.com>
> It's really a BIOS failing. The CPU cares nothing about how it's driven,
> but if the DSDT lacks methods to do anything interesting, nothing happens.
>
No it isn't. I have checked FADT and DSDT and everything is OK. David spend
last 2 days checking changes in code that I send him. ACPI C3 is working on
EPIA 800. It really don't work for BCR2 MSR. Frequency is ONLY changed on
"halt" instruction. NEVER on ACPI C3. Maybe it works on lower ACPI states,
but if I understand ACPI spec correcly only C3 state is good for this.
Worst part is that this is mentioned in documentation: AUTOHALT only.
Information about Longhaul is stripped from later datasheets. Probably
designers from Centaur add support for ACPI later. I didn't know that
AUTOHALT don't mean ACPI C3 capable. There is SLEEP signal and probably
this signal is used to put processor in C3 state.
Sorry. I'm still learning.
Rafa³
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prev parent reply other threads:[~2006-07-13 6:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-13 5:57 [PATCH] Longhaul - Only for "Powersaver" Rafał Bilski
2006-07-13 6:27 ` Dave Jones
2006-07-13 6:59 ` Rafał Bilski [this message]
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