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Thread: CPU Scaling intel_pstate testing (3.10 kernel)

  1. #31
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Based on some bug report (which should be reversed, at this point), I think that on Ubuntu the intel pstate driver might be disabled by default.
    You can test using the method pq...q mentioned.
    You can enable it via "intel_pstate=enable" in /etc/default/grub. Example (where I also disable IPV6):
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 intel_pstate=enable"
    If you modify the grub file then you have to
    Code:
    sudo update-grub
    to update the actual loader on disk. Then re-boot
    Last edited by Doug S; October 1st, 2013 at 04:46 PM.
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  2. #32
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Quote Originally Posted by Doug S View Post
    Based on some bug report (which should be reversed, at this point), I think that on Ubuntu the intel pstate driver might be disabled by default.
    I see people commenting in that bug recently about about re-enabling intel_pstate again by default.
    It may be more effective to start a new report requesting this than commenting in a 'fix-released' report

  3. #33
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    Nov 2012
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Code:
    cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver acpi-cpufreq
    This now on my Vaio Pro Haswell, and the same on my I7 3rd Generation Laptop.

    David.

  4. #34
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Along with Pstate we need the excellent Intel Thermal Daemon in ppa or software center. Currently it has to be compiled into Ubuntu. The temperature management now is better with this than in Windows. With TLP the battery life too is same as Windows if using kernel 3.11

  5. #35
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Quote Originally Posted by davidbaumann View Post
    Code:
    cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver acpi-cpufreq
    This now on my Vaio Pro Haswell, and the same on my I7 3rd Generation Laptop.

    David.

    Which version of Ubuntu do you get this?

  6. #36
    Join Date
    Nov 2012
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Hello,

    I am sorry I can't do uname -r here.
    It's both Kubuntu 13.10 x64 with Kernel 3.11.0.8 (default).

    I don't have this daemon running, only intel_pstate=enable in grub.

    David.

  7. #37
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Quote Originally Posted by davidbaumann View Post
    Hello,

    I am sorry I can't do uname -r here.
    It's both Kubuntu 13.10 x64 with Kernel 3.11.0.8 (default).

    I don't have this daemon running, only intel_pstate=enable in grub.

    David.

    This indicates that pstate is turned off by default in the Ubuntu kernel.

  8. #38
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    Oct 2013
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Does the Intel Thermal Daemon control fans? Do I need thinkfan running after installing that?

  9. #39
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    i think the bios controls fan speed by default
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  10. #40
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    Re: CPU Scaling intel_pstate testing (3.10 kernel)

    Quote Originally Posted by shuhao View Post
    Does the Intel Thermal Daemon control fans? Do I need thinkfan running after installing that?

    It controls the temperature, as mentioned the BIOS controls the fans. So if your temp is low for the BIOS threshold, its off. There is an utility called Thinkfan to control fans on Thinkpad.

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