Comment 19 for bug 1252462
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| Guilhem Marchand (guilhem-marchand) wrote | #19 |
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0e1f616
(Get the code!)
Some update:
After some search, i discovered that the intel_pstate seems to have to be enable running default Ubuntu kernel adding :
/etc/default/grub
Add:
GRUB_CMDLINE_
then sudo update-grub
After reboot, i can see the good configuration i was seing it with kernel 3.12:
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to <email address hidden>, please.
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 3.10 GHz.
current CPU frequency is 2.18 GHz (asserted by call to hardware).
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 3.10 GHz.
current CPU frequency is 3.03 GHz (asserted by call to hardware).
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 3.10 GHz.
current CPU frequency is 2.40 GHz (asserted by call to hardware).
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 3.10 GHz.
current CPU frequency is 2.55 GHz (asserted by call to hardware).
What does explain the difference between the 2 situations ?
With kernel 3.12 we don't have to manually enable intel_pstate... not sure most user would think about that to take all the benefit of last computers...