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From: jlnance@unity.ncsu.edu
To: linux-kernel@vger.kernel.org
Subject: Laptops & CPU frequency
Date: Sat, 10 Jan 2004 21:56:23 -0500	[thread overview]
Message-ID: <20040111025623.GA19890@ncsu.edu> (raw)

Hello All,
    I am running the 2.4 kernel (latest from Fedora) on a Thinkpad 600E
laptop.  If I start the laptop with the AC adapter turned on, the CPU
frequency in /proc/cpuinfo is approximatly 400 MHz.  However, if I start
the laptop on battery power, /proc/cpuinfo  indicates a processor frequency
of approximatly 100 MHz.
    The frequency displayed in /proc/cpuinfo does not change if the AC
adapter is toggled on or off after the machine has booted.  It stays
in the same mode as it was booted into.  I am curious if this is because
the CPU frequency really is not changing, or if it is because the
number in /proc/cpuinfo is only calculated at boot.


Thanks,

Jim

             reply	other threads:[~2004-01-11  2:56 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-01-11  2:56 jlnance [this message]
2004-01-11  3:17 ` Laptops & CPU frequency 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
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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