Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
Haswell package never goes lower than PC3
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware
View previous topic :: View next topic  
Author Message
Anton Gubarkov
n00b
n00b


Joined: 13 Mar 2008
Posts: 41

PostPosted: Fri Apr 15, 2016 8:29 pm    Post subject: Haswell package never goes lower than PC3 Reply with quote

I run Thinkpad T540p with i7-4700MQ. Kernel is gentoo-sources-4.5.1. The minimal power consumption I've seen is 14.4 W. I started to find out...

I've installed i7z-git and discovered that my cores are in C7 >90% of time when my PC is idle (only Gnome 3.18 shell is running)
I've installed powertop-9999 and in the idle stats I can see that core states match the data from i7z.

However the package states are like this:
Code:
C2 (pc2)   49,5%   
C3 (pc3)    7,0% 
C6 (pc6)    0,0%   
C7 (pc7)    0,0%   


I have tlp installed and running. It's doing a good job clocking down my CPU and managing other devices' power.

I've never seen my CPU package drop to PC6 or PC7. I think this is the main reason why my idle power consumption is so high.
What can I do to lower by CPU power?
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum