Linux 4.7 Notebook Power Testing: Possible Regression When Idling

[phoronix]

Phoronix: Linux 4.7 Notebook Power Testing: Possible Regression When Idling

With the Linux 4.7 kernel expected to be released this weekend, I did some Linux kernel comparison power measurements from a Lenovo ThinkPad X1 Carbon notebook. Here are those results...

http://www.phoronix.com/scan.php?page=news_item&px=Linux-4.7-BDW-Power-Test

[eggbert]

On my Dell Inspiron 7559, power management is still not fixed in 4.7. This has a skylake i7 6700HQ. Looking under powertop, the CPU package never gets past C2. It runs hot under Linux and battery life is a total bummer.

[uniquepito]

On my Dell Inspiron 7559, power management is still not fixed in 4.7. This has a skylake i7 6700HQ. Looking under powertop, the CPU package never gets past C2. It runs hot under Linux and battery life is a total bummer.

I have same problem with Inspiron 7559, there is Bug reported, please open

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602888

and click "This bug affects me" in the top-left corner and spread it, so more people report this and it could be resolved soon. I believe this is problem of power management of all Skylake mobile CPUs (don't know about U models) that they never past C2 on linux kernel, however on Windows they are just fine.

[Sloth]

On my Dell Inspiron 7559, power management is still not fixed in 4.7. This has a skylake i7 6700HQ. Looking under powertop, the CPU package never gets past C2. It runs hot under Linux and battery life is a total bummer.

I'm definitely seeing higher packages C-States here (Xeon E3-1505M):

C2 (pc2)   11.1%
C3 (pc3)    0.2%
C6 (pc6)    1.6%
C7 (pc7)    0.0%
C8 (pc8)   45.0%
C9 (pc9)    0.0%

[eggbert]

I have same problem with Inspiron 7559, there is Bug reported, please open

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602888

and click "This bug affects me" in the top-left corner and spread it, so more people report this and it could be resolved soon. I believe this is problem of power management of all Skylake mobile CPUs (don't know about U models) that they never past C2 on linux kernel, however on Windows they are just fine.

Wow dude, you sure get around I'm the guy that opened that bug. Sometimes I think you and me are the only two 7559 Linux users in existance LOL.

[GraysonPeddie]

I have same problem with Inspiron 7559, there is Bug reported, please open
https://bugs.launchpad.net/ubuntu/+s...x/+bug/1602888
and click "This bug affects me" in the top-left corner and spread it, so more people report this and it could be resolved soon. I believe this is problem of power management of all Skylake mobile CPUs (don't know about U models) that they never past C2 on linux kernel, however on Windows they are just fine.

Welcome to Phoronix Forums!

[starshipeleven]

I have same problem with Inspiron 7559, there is Bug reported, please open

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602888

and click "This bug affects me" in the top-left corner and spread it, so more people report this and it could be resolved soon. I believe this is problem of power management of all Skylake mobile CPUs (don't know about U models) that they never past C2 on linux kernel, however on Windows they are just fine.

For the nth time: for the love of dog, please report bugs to upstream project if you want someone to look at your bug at all.
The devs that work on these things don't look at Ubuntu's shitty bugtracker, nor Ubuntu devs are kind enough to move upstream bug reports.

This applies to most distros too, anyway.

[starshipeleven]

unapproved....

anyway, plz report the bugs to upstream project too, it's much more likely to get attention from the devs than sitting in Ubuntu bugtracker.

[starshipeleven]

ARE YOU ON DRUGS vBULLETTIN? STOP UNAPPROVING MY POSTS!!!

EDIT: cool, now what I wanted to say is: plz report bugs to upstream project too as it's more likely to be seen by actual devs and not languish forever in shitty Ubuntu bugtracker.

[andre30correia]

my experience with a intel i7 6500u, the kernel 4.4 is the best in power usage and pstate (since linux 4.5 is dead), the ubuntu 4.4 kernel with some backports from newer works well too, linux 4.7 have bugs and pstate don't work well in powersave( the cpu is hot and don't use the turbo like it should)