You are not logged in.

#1 2011-04-23 18:43:35

admiralspark
Member
From: Alaska, USA
Registered: 2011-01-07
Posts: 87

Power Usage Regressions in 2.6.38/.39

See the Phoronix writeup here: http://www.phoronix.com/scan.php?page=a … ffda&num=4
It looks like for some reason 2.6.38 and up are having major power usage issues. Is anybody else experiencing this? This alone is apparently a 13% increase in power consumption at idle, which would make me lose almost an hour in battery life on my netbook. Thoughts/comments?

Last edited by admiralspark (2011-04-23 18:44:01)


Team Ignition Kernel Developer
linux-ideapad developer/maintainer
Flame Kernel developer for Galaxy Nexus and Galaxy S3
Want a cheap, reliable VPS with AWESOME customer service?

Offline

#2 2011-04-23 21:50:14

demian
Member
From: Frankfurt, Germany
Registered: 2009-05-06
Posts: 709

Re: Power Usage Regressions in 2.6.38/.39

Yeah, there seems to be an increase in power consumption since .38. For me it's 0.5 - 1W (in most situations 7 to 20 % less battery life).

A fellow archer also blogged about it (itgen.blogspot.com) and made this graph:
batlog.png

This one is me comparing .37 to .38 when idling:
fx80ib.png


no place like /home
github

Offline

#3 2011-04-24 15:29:16

mrmylanman
Member
From: Altamonte Springs, FL, USA
Registered: 2011-03-13
Posts: 178

Re: Power Usage Regressions in 2.6.38/.39

I read the article on Phoronix as well, and it's interesting because my laptop is consistently getting as good (or better) battery life as what it got in Windows.  I honestly haven't spent much time using 2.6.37, since I just got my laptop not long ago, but with getting 6-7 hours now, I can't wait to see what I'll get when/if they fix this power draw regression.


Arch user since 2011-03-13

Thinkpad X220 Intel Core i7-2640M CPU, 16GB DDR3-1333 RAM, 160GB Intel SATA II SSD & 60GB OCZ mSATA SSD, 12.5" IPS 1366x768 Display, 6-cell Battery
(Installation date:  2012-03-19)

Offline

#4 2011-04-25 08:38:26

hrobeers
Member
From: Belgium
Registered: 2008-11-05
Posts: 79

Re: Power Usage Regressions in 2.6.38/.39

mrmylanman wrote:

I read the article on Phoronix as well, and it's interesting because my laptop is consistently getting as good (or better) battery life as what it got in Windows.  I honestly haven't spent much time using 2.6.37, since I just got my laptop not long ago, but with getting 6-7 hours now, I can't wait to see what I'll get when/if they fix this power draw regression.

Install 2.6.37 and you can see it today! (or install the LTS kernel, and you can switch between 2.6.32 and 2.6.38)

Offline

#5 2011-04-26 00:41:01

muffinss
Member
From: united states
Registered: 2011-02-07
Posts: 54

Re: Power Usage Regressions in 2.6.38/.39

I've noticed the power usage as well with my laptop. Before I was getting 4 hours in a-half of battery power, but now, its about 3 in a-half - 4 hours =/

Offline

#6 2011-04-26 01:47:38

mrmylanman
Member
From: Altamonte Springs, FL, USA
Registered: 2011-03-13
Posts: 178

Re: Power Usage Regressions in 2.6.38/.39

hrobeers wrote:
mrmylanman wrote:

I read the article on Phoronix as well, and it's interesting because my laptop is consistently getting as good (or better) battery life as what it got in Windows.  I honestly haven't spent much time using 2.6.37, since I just got my laptop not long ago, but with getting 6-7 hours now, I can't wait to see what I'll get when/if they fix this power draw regression.

Install 2.6.37 and you can see it today! (or install the LTS kernel, and you can switch between 2.6.32 and 2.6.38)

Well my laptop's GPU is not supported well until 2.6.38 and the closed-source drivers don't work with xorg-server 1.10 last time I checked so I figured it wasn't really worth the hassle (I don't have 1.9 in my pacman cache).

Thanks for the tip though!  New hardware is sometimes an issue with open-source software, lol.


Arch user since 2011-03-13

Thinkpad X220 Intel Core i7-2640M CPU, 16GB DDR3-1333 RAM, 160GB Intel SATA II SSD & 60GB OCZ mSATA SSD, 12.5" IPS 1366x768 Display, 6-cell Battery
(Installation date:  2012-03-19)

Offline

#7 2011-04-26 10:39:59

snack
Member
From: Italy
Registered: 2009-01-13
Posts: 763

Re: Power Usage Regressions in 2.6.38/.39

A new, even worse power regression has been found in 2.6.35:

http://www.phoronix.com/scan.php?page=a … ess2&num=1

Offline

#8 2011-04-26 12:50:39

pataphysician
Member
Registered: 2010-09-04
Posts: 46

Re: Power Usage Regressions in 2.6.38/.39

snack wrote:

A new, even worse power regression has been found in 2.6.35:

I was going to post my memory that 2.6.37 seemed like it brought a huge power performance increase, and that I did notice a power performance drop with 2.6.38, but the drop was much less than the increase I saw with 37.

Since I started with 2.6.35 on this laptop, it all makes sense now, though even the horrible 2.6.35 had the same battery life for me as windows 7(clean install, so no manufacturer crapware eating power) in multiple tests.

Offline

#9 2011-10-20 04:20:05

heatblazer
Member
Registered: 2011-09-03
Posts: 26

Re: Power Usage Regressions in 2.6.38/.39

Hello, I am having the same issue. I am using asus eeepc 904HD, and arch linux. Tested laptop_mode and now using power manager under xfce4, the battery lives under hour or even worse, around 40-35 minutes. Month ago it lasted for 1 h and 20-30 min. sad

Offline

#10 2011-10-20 07:20:28

ethail
Member
From: Spain
Registered: 2011-02-10
Posts: 225

Re: Power Usage Regressions in 2.6.38/.39

heatblazer: That's for 2.6.39, we live in 3.0.6.

try searching the bbs for more info and solutions about that power regressions.


My GitHub Page

Best Testing Repo Warning: [testing] means it can eat you hamster, catch fire and you should keep it away from children. And I'm serious here, it's not an April 1st joke.

Offline

#11 2011-10-20 07:23:30

heatblazer
Member
Registered: 2011-09-03
Posts: 26

Re: Power Usage Regressions in 2.6.38/.39

ethail wrote:

heatblazer: That's for 2.6.39, we live in 3.0.6.

try searching the bbs for more info and solutions about that power regressions.

3.0-ARCH #1 SMP PREEMPT Fri Oct 7 10:11:05 UTC 2011 i686 Intel(R) Celeron(R) M processor 900MHz GenuineIntel GNU/Linux

It`s still a power eater... Any info?

Offline

#12 2011-10-20 11:49:30

pogeymanz
Member
Registered: 2008-03-11
Posts: 1,020

Re: Power Usage Regressions in 2.6.38/.39

If you have intel hardware, there are a few articles at phoronix.com about the power regressions and possible workarounds for some of it.

Even with those fixes, my computer uses more power than it did in the 2.6.34/35 days.

Offline

#13 2011-10-20 12:38:03

kokoko3k
Member
Registered: 2008-11-14
Posts: 1,945

Re: Power Usage Regressions in 2.6.38/.39

My experience with a 2 years old (happy birthday!) eeepc 1005ha monitored with ibam says that the estimated battery life is just 5% under the the limit claimed by asus in idling mode with wifi on and backlight to 25%.
This with linux 3.0.4-pf, (adding pcie_aspm=force, i915.i915_enable_rc6=1)and all the suggestions by powertop.
http://phoronix.com/forums/showthread.p … post227549

Last edited by kokoko3k (2011-10-20 12:46:15)

Offline

Board footer

Powered by FluxBB