CoreDuo Bus-Master-Activity on Core1 ffffffff when idle, no C3

[Sascha Heid <saschaheid@gmail.com>]

Hi List!


i recently got a Lenovo X60T, installed Gentoo Linux, and since then i
am trying to figure out why i miss 2h of battery-life compared to
Windows-Users. After a while i noticed that the Bus-Master-Activity on
CPU1 is ffffffff when its idle and only drops if i give it some work to
do (like a kernel compile with make -j3)
When i put some load on both cores the Bus Master Activity of CPU1 is
normalizing itself and varies according to the load. 
When i leave the Laptop idle for a while it gets actually hotter (60C)
then when i use it (44C).
The CPU is not able to stay in C3, it tries but comes back to C2 within
the second, i assume that is because of the high Bus Master Activity of
CPU1?

I have already looked for help about this on various forums and mailing
lists and i talked to other people with CoreDuo's and they do not have
this issue with the Bus Master Activity.

I tried alot of different kernels (2.6.19 and 2.6.20) and setups or used
preconfigured Kernels or even Live-Distros.
I also booted a *very* minimal Gentoo-Linux setup, no WLAN, no USB, no X
etc., and played with the BIOS-Settings (disabling as much as possible),
and now i am at a point where i really dont know what to do anymore and
i fear that im not getting any answers anywhere.

If anyone has any advice, information or would like to see some logs or
configs, i would be very gratefull.

Greetings from Germany,
Sascha