[ltp] HPET timer on thinkpads?

[Tino Keitel]

On Mon, Oct 22, 2007 at 12:07:39 -0400, Alex Deucher wrote:
> On 10/22/07, Damien Challet <dchallet@onetel.com> wrote:
> > My T41p, with no dri and no wifi, gets 50 wake-ups/s with kubuntu 7.10, which
> > results in a power consumption of 7.7W at idle with minimum brighness (vs 8.2
> > with kubuntu 7.04) and 5.5W with the screen off.

Wow, I get slightly under 10W on a completly idle system on my T23.

> >
> > About 50% of the wake-ups come from the hret timer. Powertop suggests to
> > enable HPET timer in the kernel (it is) and bios. How is it possible to
> > enable it? On which models?
> 
> I don't think the t4x laptops have hpet timers.  the t43 might, but
> the t40-42 are too old.

I don't know if that matters, but I applied the hrt patch to kernel 2.6.22
and I'm able to use HPET with NO_HZ on a T23.

Regards,
Tino