1

Laptops: More power on power, More battery on Duracell

view story
linux-howto

http://crunchbang.org – I wish that I could have a workstation at home and a laptop, but I can't. I live in a tiny cramped apartment in Korea, and frankly I really like working from coffeeshops and having one computer (a laptop) is the best solution. So I use an ivy-bridge i7 laptop. Problem is that it is fast. Why is that a problem? It is fast enough to not kick in the cpu-scaling-governor. With the default ondemand governor all four cores of my cpu can hover from 35-50% but only at 775Mhtz when compiling software and building things with debootstrap. since it won't "kick inti high gear" the comp (HowTos)

ziyi's picture
Submitted by ziyi on 12/29/2012

Stories similar to Laptops: More power on power, More battery on Duracell

Fresh install of Arch.

Hey! Glad I was able to help! I was kinda wondering if I was the only one with this problem.I think the reason we only had the problem on battery power is because laptop mode tools itself is set by default to run only when on battery power.

I searched on Google for ways to tweak this governor for better battery life and I came across this

To bias ondemand towards battery saving, set high up-thresholds and higher sampling-rate.

For the record, this problem persisted after the upgrade to kernel 3.6. I "fixed" it by tweaking the performance governor, setting the up_threshold to 90 instead of the default 95.

I installed the new Blackout ICS ROM v.3.1.0

Issue with SetCPU (the free version posted here in XDA).

The default setting for this ROM is 1024 MHz with Performance as the Governor.

I tried changing the Governor from Performance to Ondemand. When I set it with SetCPU, the Ondemand governor takes over.

Raynman wrote:Not sure about 3, but everything else is covered in the wiki article linked by you.Configuring CPU scaling is a 3-part process:  1.  Load appropriate CPU frequency driver  2.  Load desired scaling governor(s)  3.  Select a method to manage switching and tuning governor(s):You stopped after the second part.Ye, you were right.

Sometimes when I pick up my laptop, it decides to stop the power supply running. It will just suddenly go black and not save my documents. When it happens, it makes a high pitch power down noise then just goes to black, where I then need to restart it. What could be the problem? Could my battery be loose?

Also, my laptop says, "consider changing your battery". Is it broken? Or faulty?

I am using conky to see CPU freq. I have verified its findings though the above posted output of:cpufreq-infoI can change the governor, both with mynis01's code and with the powersaver script re-implememted.Going to performance does raise freq to 2000The big problem is that ondemand does nothing.

Dheart wrote:Yeah, figured it out. Misunderstood the problem, I just don't want the processor to downclock and reclock multiple times while doing something. Like changing the current dir while compiling. Actually during loading KDE the clock changes about 15 times...Err, that's *good*. The cpu clocks up to do the job as fast as possible, so that it can go to sleep as soon as possible.