[ltp] 600x: How to max Processor speed?

[Markus Alt]

Boyan wrote:
> 
> Hello,
> 
> to continue the subject on the 600x here is my problem.
> 
> When I boot linux without a battery and CDRom plugged in (that is my
> default option) I get invariably 498 MHz processor speed. Very often,
> however, I would prefer to enjoy the full 650 MHz speed that my 5FG model
> is capable of but alas without success.
> 
> Disabling Power management and/or Speed step from BIOS in my win98
> partition does not help either. So far only if I boot with both battery
> and CDRom (and that is what I'd rather avoid) can I see processor speed at
> 650MHz. Does anyone have the same problem?

I've seen the same behaviour also with a 600X and with a T21, too. It
seems like a "feature" of the Intel SpeedStep mechanism. If there's no
battery in the machine or if the battery is at low charge when booting
the system, the clock speed is "reduced" (according to the output of
"cat /proc/cpuinfo").

Like you, I haven't found any way to make the machine run at full speed
everytime, although I've selected "Maximum Performance" in the
corresponding BIOS menu for both AC and battery mode. Apparently, the
only possibility is to boot with a charged battery (and remove if later,
if you want to).

The CD-ROM shouldn't matter in this case.

> The distribution I have is suse 7.1 with kernel 2.4.0 and kde 2.1.1. In
> almost every other respect I am pleased with this kernel and I would
> appreciate any suggestion that does not require updating the kernel, if
> possible.

As I've had this with different version of the SuSE distro and different
kernel versions (2.2 and 2.4), I don't think that it's related to these. 

Regards,
Markus

-- 
Markus Alt
IBM Lab Boeblingen, Germany
altmark@de.ibm.com

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