CPU cannot get bellow pc3

with the lemons! · 2015-09-10 06:30:54

I noticed my batery life got much worse (it lasts only 3.5 versus 7 hours it used to be about month or two ago) and cpu temps also got higher. CPU usage is normal. Upon closer look, I noticed CPU never gets below PC3 state. In past, I got all states down to PC10, now it won't go below PC3.

What could be causing this? I don't remember installing something that could prevent CPU from getting good rest.
https://i.imgur.com/wWfsZ6s.png

Last edited by jasonwryan (2015-09-10 07:20:54)

jasonwryan · 2015-09-10 06:45:06

Your image is broken...

Try a different kernel.

Moving to NC.

with the lemons! · 2015-09-10 06:46:59

I'm using 4.1.6, what kernel would you suggest?

jasonwryan · 2015-09-10 06:56:08

I would suggest you read the Etiquette about posting images: http://wiki.archlinux.org/index.php/For … s_and_Code and not post screenshots of text, paste the actual text.

You can try -lts to start and there are a number of others in AUR if you don't want to compile your own...

with the lemons! · 2015-09-10 07:16:38

I'm sorry, I thought that since PowerTop output is interactive and formated, it would be better to post as screenshot.

I tried linux-zen and linux-lts and my problems persist.

jasonwryan · 2015-09-10 07:21:57

Probably a hardware issue, then. When did you last clean the vents?

with the lemons! · 2015-09-10 07:26:46

About 6 months ago, I'll try cleaning them again. But how can that prevent CPU from going to lower state?

Last edited by with the lemons! (2015-09-10 07:31:58)

with the lemons! · 2015-09-10 20:14:43

Cooler was nearly dust-free and cleaning it made no difference. Is there way to determine what is preventing CPU from going to lower sleep state?

Solvialle · 2015-09-11 16:07:03

The most likely cause IME is some other piece of hardware (SATA controller, network card, sound card, graphics card, USB devices, etc.) not being in its power-saving mode, thus necessitating the CPU package to stay at PC3 to keep the necessary links alive.

For example, I just changed the SATA ALPM settings on my desktop to min_power on all links, the CPU now does enter pc6. Try toggling the tunables powertop is suggesting.

Last edited by Solvialle (2015-09-11 16:16:46)

with the lemons! · 2015-09-11 19:51:45

Solvialle wrote:

The most likely cause IME is some other piece of hardware (SATA controller, network card, sound card, graphics card, USB devices, etc.) not being in its power-saving mode, thus necessitating the CPU package to stay at PC3 to keep the necessary links alive.
For example, I just changed the SATA ALPM settings on my desktop to min_power on all links, the CPU now does enter pc6. Try toggling the tunables powertop is suggesting.

Yes, that's what I was thinking. But all Powetop tunables are (and always were) set to recommended value.

Arch Linux

#1 2015-09-10 06:30:54

CPU cannot get bellow pc3

#2 2015-09-10 06:45:06

Re: CPU cannot get bellow pc3

#3 2015-09-10 06:46:59

Re: CPU cannot get bellow pc3

#4 2015-09-10 06:56:08

Re: CPU cannot get bellow pc3

#5 2015-09-10 07:16:38

Re: CPU cannot get bellow pc3

#6 2015-09-10 07:21:57

Re: CPU cannot get bellow pc3

#7 2015-09-10 07:26:46

Re: CPU cannot get bellow pc3

#8 2015-09-10 20:14:43

Re: CPU cannot get bellow pc3

#9 2015-09-11 16:07:03

Re: CPU cannot get bellow pc3

#10 2015-09-11 19:51:45

Re: CPU cannot get bellow pc3

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