[ltp] T420s Power saving tips

Tino Keitel linux-thinkpad@linux-thinkpad.org
Tue, 3 Apr 2012 09:58:42 +0200

On Mon, Apr 02, 2012 at 14:14:59 -0400, Dan Maranville 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"

What kernel are you running?