Re: C2, C3 and bus master activity

[Bob Lees <bob-l+PWtdWbHAsG2Il/BtU0GPXRex20P6io@public.gmane.org>]

Hi

In a word USB.  I don't fully understand why, but if I disable USB then both 
my laptops will go into C3 or C4, with USB enabled stays in C2.

Laptops are Compaq EVO 800c and IBM T42p both running SUSE 9.3 with a stock 
SuSE kernel 2.6.11-suse modified

Bob

On Tuesday 19 July 2005 19:50, pumpkin wrote:
> Hello
>
> My CPU does not enter C3 if i run the stock configuration. Way too much bus
> master activity. I want to find out what is causing it. Any hints how to do
> that ?
>
> I found one possible cause for some of the activity. Without X i have a
> 50:50 mix between C2 and C3. Using the vesa-driver the mix stays at 50:50.
> Using the radeon-driver (dri disabled) the CPU stops using C3.
>
> the facts in case somebody already has a idea:
> - ibm R51
> - PentiumM 725 (1.6GHz)
> - Intel 855PM chipset
> - radeon 7500 mobil
> - xorg 6.8.2
> - kernel 2.6.11-1-686 (debian stock-kernel)
>
> thanks.
>
>
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