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)
