From owner-freebsd-mobile@FreeBSD.ORG  Tue Aug 30 05:37:33 2005
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Date: Tue, 30 Aug 2005 13:36:59 +0800
From: Erich Dollansky <oceanare@pacific.net.sg>
Organization: oceanare pte ltd
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To: Frank Staals <frankstaals@gmx.net>
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Cc: freebsd-mobile@FreeBSD.org
Subject: Re: CPU Speed AMD XP-M 2800+
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Hi,

Frank Staals wrote:
> Hey,
> 
> I have an Acer Aspire 1356 LCi laptop and I'm running FreeBSD 
> 5.4-Release. In my laptop I have an AMD XP-M 2800+ which clockspeed 
> should be around 2100 Mhz according to Wikipedia ( 
> http://en.wikipedia.org/wiki/List_of_AMD_Athlon_XP_microprocessors#Athlon_XP-M_.22Barton.22_.28Desktop_Replacement.2C_72W_TDP.2C_Socket_A.29 
> ) allthough I recently found out is is only running at +/- 800 Mhz :
> 
> frank@Riza$ cat /var/run/dmesg.boot | grep CPU
> CPU: Mobile AMD Athlon(tm) XP 2800+ (796.10-MHz 686-class CPU)
> cpu0: <ACPI CPU (3 Cx states)> on acpi0
> 
> Because of this I have problems decoding/playing an AVC ( H264 ) video 
> file. Is there a way to throttle the CPU speed, since it is probably 
> always running on low-power mode ?
> 
I do not know how it works with AMD CPUs but I think the concept is the 
same as for Transmeta CPUs. There is a driver - longrun for Transmeta - 
which does this switching for you.

You should find more in the handbook.

Erich