From: Robert Love <rml@ximian.com>
To: Matthew Garrett <mgarrett@chiark.greenend.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Laptops & CPU frequency
Date: Sun, 11 Jan 2004 12:13:20 -0500 [thread overview]
Message-ID: <1073841200.1153.0.camel@localhost> (raw)
In-Reply-To: <E1Afj2b-0004QN-00@chiark.greenend.org.uk>
On Sun, 2004-01-11 at 12:06, Matthew Garrett wrote:
> Is this true even when the speed changes aren't done through Speedstep?
> Some older (PII/non-Speedstep PIIIs) Thinkpads automatically change
> speed based on presence of AC power, but do it in a way that's exposed
> as an ACPI throttling state rather than a performance state. My
> experience is that this doesn't result in cpuinfo getting updated, and
> various kernel things seem to become unhappy. On the other hand, I
> haven't tried this since 2.5.5something - I just told the BIOS not to
> touch stuff instead.
No - if the laptop changes speed on its own, using a system that Linux
does not understand, then Linux won't know about the change,
/proc/cpuinfo will not be updated, and stuff won't go too good.
Robert Love
next prev parent reply other threads:[~2004-01-11 17:13 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-11 2:56 Laptops & CPU frequency jlnance
2004-01-11 3:17 ` Robert Love
2004-01-11 4:12 ` Valdis.Kletnieks
2004-01-11 6:16 ` Willy Tarreau
2004-01-11 10:27 ` Xavier Bestel
2004-01-11 10:33 ` Xavier Bestel
2004-01-12 16:58 ` Jerry Cooperstein
2004-01-12 21:19 ` Xavier Bestel
2004-01-12 19:52 ` john stultz
2004-01-12 20:11 ` Disconnect
2004-01-12 23:19 ` john stultz
2004-01-12 21:28 ` Xavier Bestel
2004-01-12 22:07 ` john stultz
2004-01-13 9:13 ` Xavier Bestel
2004-01-11 17:06 ` Matthew Garrett
2004-01-11 17:13 ` Robert Love [this message]
2004-01-11 17:44 ` Matthew Garrett
2004-01-11 17:54 ` Robert Love
2004-01-14 4:59 ` Dave Jones
2004-01-14 19:11 ` Daniel Gryniewicz
2004-01-14 19:17 ` Robert Love
2004-01-14 19:23 ` Daniel Gryniewicz
2004-01-15 20:42 ` Pavel Machek
2004-01-15 21:18 ` Daniel Gryniewicz
2004-01-15 22:21 ` John Bradford
2004-01-15 22:48 ` Pavel Machek
2004-01-19 17:44 ` Ducrot Bruno
2004-01-16 10:47 ` Pavel Machek
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