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I'm using a Thinkpad T440 with Ubuntu 13.10, and Turboboost doesn't seem to be working. The processors almost always remain at the minimum, 0.8Ghz.

Here is the output of turbostat:

cor CPU    %c0  GHz  TSC SMI    %c1    %c3    %c6    %c7 CTMP PTMP   %pc2   %pc3   %pc6   %pc7   %pc8   %pc9  %pc10  Pkg_W  Cor_W GFX_W
         99.96 0.80 2.49   0   0.04   0.00   0.00   0.00   49   50   0.00   0.00   0.00   0.00   0.00   0.00   0.00   4.52   1.68  0.02
  0   0  99.99 0.80 2.49   0   0.01   0.00   0.00   0.00   49   50   0.00   0.00   0.00   0.00   0.00   0.00   0.00   4.52   1.68  0.02
  0   1  99.99 0.80 2.49   0   0.01
  1   2  99.87 0.80 2.49   0   0.13   0.00   0.00   0.00   47
  1   3  99.99 0.80 2.49   0   0.01

During this, I'm running 4 busy loops so htop reports every core to be running at 100%.

My processor: Intel® Core™ i5-4300U CPU @ 1.90GHz × 4

Anyone have any guesses why the cpu frequency doesn't update?

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  • There's a slightly bigger issue: your processor frequency isn't changing at all. Even without turboboost, you should be able to go up to 1.9 Ghz. With turboboost, you could go up to 2.9 Ghz. Mar 20 '14 at 0:16
  • Oh right. I was thinking turboboost was what controlled all changing of the CPU frequency. I've updated the question, thanks. Mar 20 '14 at 0:41
  • Is the CPU hogging program running in the idle or maximum nice priority class?
    – psusi
    Mar 20 '14 at 3:48
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You can also monitor frequency changes using my GUI , and beside that, low, high & Turbo ratios.

You will be surprise that standard /proc/cpuinfo is not accurate because the Base Clock is not updated. Check one of the Widgets I named System Information.

In the other Widget named Cores, click Task to see in real time which processes are hogging your CPUs.

You can get source code and instructions at http://code.google.com/p/xfreq/

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Still not sure what was causing the problem, but I just decided to update to Ubuntu 14.04 (Beta 1) and the CPU seems to be scaling properly now.

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