touch-packages team mailing list archive

[Kaspar Tint <kaspar.tint@xxxxxxxxx>]

Public bug reported:

When booting into Windows partition, it manages to downclock and lower
the V-core of my Intel i5-4570 CPU. This gives me a steady 25 C
temperature during idle time. (measured with physical device and
measured with Windows application called SpeedFan).

On Ubuntu, this does not seem to happen. Even if I do echo "ondemand" | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor  , the CPU temperature is still about 40 C high during idle time. 
I do this measurement after clean boot, CPU usage is 0-6% and temp is 40 C steady. 
I use xsensors to look at my CPU temps and frequencies.

This means that Ubuntu does not effectively downclock and lower the
V-core of CPU when computer is in a idle state. I belive this is true to
any version of Ubuntu now as I can see the effect on my Laptops that are
using Ubuntu also. The battery life is much shorter than it is with
Windows running on them.

I have made my tests with a desktop computer using:

CPU: i5-4570
GPU: GTX 760
Mobo: Asus B85-Plus
OS: Ubuntu 14.04 64 bit

Also made tests on various Lenovo thinkpads and Ultrabooks. Results
remain the same, Ubuntu makes the CPU a lot hotter because of the
reasons I posted.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1351950

Title:
  Ubuntu does not put CPU into idle state

Status in “network-manager” package in Ubuntu:
  New

Bug description:
  When booting into Windows partition, it manages to downclock and lower
  the V-core of my Intel i5-4570 CPU. This gives me a steady 25 C
  temperature during idle time. (measured with physical device and
  measured with Windows application called SpeedFan).

  On Ubuntu, this does not seem to happen. Even if I do echo "ondemand" | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor  , the CPU temperature is still about 40 C high during idle time. 
  I do this measurement after clean boot, CPU usage is 0-6% and temp is 40 C steady. 
  I use xsensors to look at my CPU temps and frequencies.

  This means that Ubuntu does not effectively downclock and lower the
  V-core of CPU when computer is in a idle state. I belive this is true
  to any version of Ubuntu now as I can see the effect on my Laptops
  that are using Ubuntu also. The battery life is much shorter than it
  is with Windows running on them.

  I have made my tests with a desktop computer using:

  CPU: i5-4570
  GPU: GTX 760
  Mobo: Asus B85-Plus
  OS: Ubuntu 14.04 64 bit

  Also made tests on various Lenovo thinkpads and Ultrabooks. Results
  remain the same, Ubuntu makes the CPU a lot hotter because of the
  reasons I posted.

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