Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have upgraded my laptop from Intel Pentium P6100 to Core i5-460M. i5 supports Turbo Boost. To switch this I need to do:

    echo 0 or 1 > /sys/devices/system/cpu/cpufreq/boost

But my System doesn’t have this file. When I start system from LiveCD this file is present in root of LiveCD. LiveCD has same version as installed System.

Also I have problem with integrated graphics. After boot I have such message:

    unim95@UNIm95-Thinkpad:~$ dmesg |grep 915
    [   26.342983] intel ips 0000:00:1f.6: failed to get i915 symbols, graphics turbo disabled

How can I control intel VGA when

    ll /sys/kernel/debug/ |grep vgaswitcheroo

Gives no output.

  1. OS:= Ubuntu 12.04 LTS(LiveCD too)
  2. Laptop:= ThikPad Edge 14 0578RE8
  3. Processor:= Corei5-460M
  4. VGA:= Ati HD4570/5145
share|improve this question

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.