[ltp] T420s Power saving tips

[Geraint Yang]

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I have a T420 (i5 2410), too. And I am using the parameters you mention in
last letter, it works fine on my Gentoo box, Before using it, I could only
get 2.5 hours too and about 4 hours in Windows, but after I using the
amazing parameters, I get nearly 6 hours in Linux (without flash and
video). If it doesn't work well in your box, maybe some features in kernel
are disabled in default RHEL kernel(I just guess). And you can also use
powertop to find out what app is wasting your power.
I hope it may help you a litter.


On Tue, Apr 3, 2012 at 2:14 AM, Dan Maranville <danmaran@gmx.com> wrote:

> All, Having just recently upgraded to a T420s(Intel GMA & SSD/SATAII/) I'm
> in need of some power saving tips. My battery is chewed up quite fast under
> PUIAS 6.2 (RHEL) I've done some normal adjustments like screen brightness,
> idle timers etc. but the real need is when I am _using_ the machine. I'm
> lucky to squeak out 2.5 hours out of this bad boy, when in a Win world I
> can get 4 with ease. So there are some tweaks I feel I am missing.
>
> I did just add this to my kernel line and I am hoping it provides some
> measure of relief:
> "i915.i915_enable_rc6=1 i915.semaphores=1 i915.i915_enable_fbc=1
> i915.lvds_downclock=1 pcie_aspm=force"
>
> Any other tips for this model are greatly appreciated.
>
> ---
> Dan
> :w! saves
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>


Thanks,

-- 
Geraint Yang

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I have a T420 (i5 2410), too. And I am using the parameters you mention in =
last letter, it works fine on my Gentoo box, Before using it, I could only =
get 2.5 hours too and about 4 hours in Windows, but after I using the amazi=
ng parameters, I get nearly 6 hours in Linux (without flash and video). If =
it doesn&#39;t work well in your box, maybe some features in kernel are dis=
abled in default RHEL kernel(I just guess). And you can also use powertop t=
o find out what app is wasting your power.<br>

I hope it may help you a litter.<br><br><br><div class=3D"gmail_quote">On T=
ue, Apr 3, 2012 at 2:14 AM, Dan Maranville <span dir=3D"ltr">&lt;<a href=3D=
"mailto:danmaran@gmx.com">danmaran@gmx.com</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">

All, Having just recently upgraded to a T420s(Intel GMA &amp; SSD/SATAII/) =
I&#39;m in need of some power saving tips. My battery is chewed up quite fa=
st under PUIAS 6.2 (RHEL) I&#39;ve done some normal adjustments like screen=
 brightness, idle timers etc. but the real need is when I am _using_ the ma=
chine. I&#39;m lucky to squeak out 2.5 hours out of this bad boy, when in a=
 Win world I can get 4 with ease. So there are some tweaks I feel I am miss=
ing.<br>


<br>
I did just add this to my kernel line and I am hoping it provides some meas=
ure of relief:<br>
&quot;i915.i915_enable_rc6=3D1 i915.semaphores=3D1 i915.i915_enable_fbc=3D1=
 i915.lvds_downclock=3D1 pcie_aspm=3Dforce&quot;<br>
<br>
Any other tips for this model are greatly appreciated.<br>
<br>
---<br>
Dan<br>
:w! saves<br>
<span class=3D"HOEnZb"><font color=3D"#888888">--<br>
The linux-thinkpad mailing list home page is at:<br>
<a href=3D"http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpa=
d" target=3D"_blank">http://mailman.linux-thinkpad.org/mailman/listinfo/lin=
ux-thinkpad</a><br>
</font></span></blockquote></div><br><br clear=3D"all">Thanks,<br><br>-- <b=
r><div style=3D"text-align:left">Geraint Yang </div><br>

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