Hello,
Another x201 user here, suffering from the same problem. Any news/solutions
on this issue?
Sincerely thanks,
Jingcheng
2015-05-21 22:22 GMT+08:00 Shaun Reiger <srei...@sprmail.net>:
> Thanks for the update.
>
> On Thursday, May 21, 2015, Stefan Sperling <s...@stsp.name> wrote:
>
> > On Wed, May 20, 2015 at 08:56:57PM -0600, Shaun Reiger wrote:
> > > Hello I'm trying to find out if the power consumption relating to the
> > > intel_powerclamp driver ("Package Level C-state Idle Injection for
> > > Intel CPUs") was ever fixed. I'm current running 5.7 stable and I find
> > > my cpu is still consuming 6W of power in any state. It was mentioned
> > > in the emails from last year that a Linux driver fixed this issue. Any
> > > updates on this issue would be great. I have attached my dmesg for
> > > review.
> > >
> > > Thanks
> >
> > There was some work in progress for C-state support by guenther@ but
> > I'm not sure what the current status is. I got about one additional
> > hour of battery life out of it when I tested it once. With plain
> > -current I get about 2h of runtime out of the battery.
> >
> > Getting to the levels of Linux (additional 4 hours in my case) probably
> > requires invasive changes to the process scheduler (prevent it from
> > scheduling processes on certain cores to avoid waking them) and/or the
> > inteldrm(4) driver (to put the GPU into power-save mode).
> >
> > It seems the x201 has a CPU generation which requires a ton of special
> > support code in drivers for good power saving, while subsequent
> > generations of laptops (x220 and later) use CPUs which don't really
> > require that much of it. Overall I'm not sure it's really worth pouring
> > a lot of development resources into optimizing for the x201 generation.
> > Other laptops already run much longer.
> >
>
>
> --
> Shaun
>
> "Ars longa, vita brevis, occasio praeceps, experimentum periculosum,
> iudicium difficile" - Hippocrates (c. 400BC)
>
>
--
Best regards,
Jingcheng Zhang
Beijing, P.R.China
