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Old 06-16-2013, 07:43 PM   #1
torimus
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Another power-saving regression in 3.9.5 kernel ?


Just curious if anybody else experienced some issues with increased power consumption with the updated kernel 3.9.5 from Slackware current ?

After a clean boot power consumption/internal temperature are in the same levels like with 3.8.x kernel. However after a suspend/resume cycle, powertop shows consumption gets almost doubled (from 8W to 15W). The temperature also raises from 42C upto ~ 60C.

Is it just me ?

Slackware64-current
 
Old 06-16-2013, 09:36 PM   #2
guanx
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Can you compare the output of powertop before/after suspend?

BTW, I have not yet upgraded from Linux-3.7.10 because the 3.8+ kernels crash on each disconnect from bluetooth DUN.
 
Old 06-17-2013, 05:16 AM   #3
torimus
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Quote:
Originally Posted by guanx View Post
Can you compare the output of powertop before/after suspend?
Yes. As I've already mentioned before suspend powertop shows immediate input around 8 Watts (same as with 3.8.13 kernel), after resume it's around 15 Watts (different to 3.8.13, it did kept input ~ 8W).
 
Old 06-17-2013, 07:36 AM   #4
torimus
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Just figured out it's `btusb' module (bluetooth usb driver) won't properly resume after a suspend.
Blacklisted in /etc/modprobe.d/ as a (temporary) workaround. Fortunately I don't need it anyway.
 
Old 06-17-2013, 08:33 AM   #5
clod89
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Yes I can confirm that I think it's the new PSTATE driver fault, the frequencies seem to be stuck at > 1GHz most of the time according to /proc/cpuinfo. I have tested with 3.9.1 and the issue does not seem to be there though.
 
Old 06-17-2013, 04:28 PM   #6
guanx
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Quote:
Originally Posted by torimus View Post
Yes. As I've already mentioned before suspend powertop shows immediate input around 8 Watts (same as with 3.8.13 kernel), after resume it's around 15 Watts (different to 3.8.13, it did kept input ~ 8W).
Yes I saw this. It does not help because this statement contains no detail.

As you see you had to figure it out by yourself.
 
  


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