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Message #06837
[Bug 1351950] Re: Ubuntu does not put CPU into idle state
** Package changed: network-manager (Ubuntu) => powermanagement-
interface (Ubuntu)
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https://bugs.launchpad.net/bugs/1351950
Title:
Ubuntu does not put CPU into idle state
Status in “powermanagement-interface” 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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References