From: Peter Clifton <pcjc2@cam.ac.uk>
To: "Lincoln Baxter, III" <lincolnbaxter@gmail.com>
Cc: linux-acpi@vger.kernel.org
Subject: Re: HP nc6400 v.03 or v.05 laptop ACPI fails after reboot, works again after booting windows
Date: Thu, 21 Dec 2006 22:40:51 +0000 [thread overview]
Message-ID: <1166740851.5576.5.camel@pcjc2lap> (raw)
In-Reply-To: <458B0027.2000909@gmail.com>
On Thu, 2006-12-21 at 16:44 -0500, Lincoln Baxter, III wrote:
[snip]
> Can someone point me to the code that determines the voltage / amperage
> pairings for CPUs in power saving mode? Is this handled by the ACPI bios
> (bios function call), or does the kernel directly affect the power setting?
>
> I'd like to take a look and see what's going on.
I can't recall where in the code this is, but it is the bios which
provides the voltage/frequency pairings. The speed-step drivers for
older processors actually have them hard-coded as a table.
If you're not seeing the highest frequency - I don't know what the
problem is. Mine re-appeared after the rmmod psmouse trick I posted
earlier. The CPU specs are in a separate SSDT on my laptop, which only
shows up when the appropriate bios setting for speedstep is ticked, and
the bios is "happy" (psmouse removed before shutdown).
Peter C.
next prev parent reply other threads:[~2006-12-21 22:41 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-12 23:14 HP nc6400 v.03 or v.05 laptop ACPI fails after reboot, works again after booting windows Lincoln Baxter, III
2006-12-12 23:42 ` Peter Clifton
2006-12-13 7:54 ` Lincoln Baxter, III
2006-12-13 12:25 ` Peter Clifton
2006-12-15 13:41 ` Lincoln Baxter, III
2006-12-15 14:10 ` Peter Clifton
2006-12-15 14:38 ` Lincoln Baxter, III
2006-12-15 22:35 ` Lincoln Baxter, III
2006-12-16 4:30 ` Pavel Troller
2006-12-16 7:59 ` Lincoln Baxter, III
2006-12-16 8:17 ` Frank Ursel
2006-12-17 18:51 ` Lincoln Baxter, III
2006-12-21 21:44 ` Lincoln Baxter, III
2006-12-21 22:40 ` Peter Clifton [this message]
2007-01-05 14:18 ` Thomas Renninger
2007-01-12 5:51 ` Luming Yu
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