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14.10 - Enable full performance on Sandy Bridge laptop - Ask Ubuntu.html
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<!DOCTYPE html>
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<title>14.10 - Enable full performance on Sandy Bridge laptop - Ask Ubuntu</title>
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<p>I have 2nd gen Intel i7 laptop. I use Thermald and tlp for managing
battery life (they are great!). However, sometimes I don't care about
noise and power consumption, and want the CPU to run at full 3.5GHz. For
some reason, this seems impossible to achieve. The fan never runs full
speed, and the processor is always throttled down. When I use
cpufreq-info I never see more than 2.8GHz (so turbo boost does not
work), and the frequency drops down to 800Mhz when the fan starts
getting "loud". This is with intel p-state and performance governor.
Powersafe governor is even "worse", but that's good as it increases
battery life.</p>
<p>Any ideas how to enable "full power"?</p>
<p>Thank you!</p>
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asked <span title="2015-03-01 21:34:37Z" class="relativetime">Mar 1 '15 at 21:34</span>
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<span class="comment-copy">i added sudo update-grub to the instructions</span>
– <a href="http://askubuntu.com/users/167115/mchid" title="14,861 reputation" class="comment-user">mchid</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822587_591594"><span title="2015-03-01 21:46:57Z" class="relativetime-clean">Mar 1 '15 at 21:46</span></a></span>
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<span class="comment-copy">I have seen several very
similar threads / questions. While I have no proof, I think something is
wrong with Thermald / intel_pstate interaction. As a test, you should
try the acpi_cpufreq driver
(GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable" in /etc/default/grub)
and / or disabling thermald.</span>
– <a href="http://askubuntu.com/users/372967/doug-smythies" title="3,548 reputation" class="comment-user">Doug Smythies</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822589_591594"><span title="2015-03-01 21:48:06Z" class="relativetime-clean">Mar 1 '15 at 21:48</span></a></span>
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<span class="comment-copy">also you have to enable turbo boost in /etc/default/tlp</span>
– <a href="http://askubuntu.com/users/167115/mchid" title="14,861 reputation" class="comment-user">mchid</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822597_591594"><span title="2015-03-01 21:57:18Z" class="relativetime-clean">Mar 1 '15 at 21:57</span></a></span>
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<span class="comment-copy">@mchid: I only meant as a test. Something is wrong somehow and I'd sure like to figure out what.</span>
– <a href="http://askubuntu.com/users/372967/doug-smythies" title="3,548 reputation" class="comment-user">Doug Smythies</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822598_591594"><span title="2015-03-01 22:00:11Z" class="relativetime-clean">Mar 1 '15 at 22:00</span></a></span>
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<span class="comment-copy">@mchid: That is not true, and
the article is obsolete. intel_pstate powersave is the same or better
than acpi-cpufreq ondemand; intel-pstate performance = same as
acpi-performance. However, I'm not sure what changes get backported to
previous kernels.</span>
– <a href="http://askubuntu.com/users/372967/doug-smythies" title="3,548 reputation" class="comment-user">Doug Smythies</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822609_591594"><span title="2015-03-01 22:20:22Z" class="relativetime-clean">Mar 1 '15 at 22:20</span></a></span>
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<p>Yes, all you have to do is:</p>
<p>first, set tlp "governer" to performance for both ac and batt in your
/etc/default/tlp file and while you are there, go ahead and enable
turbo boost as well</p>
<p>then, edit /etc/default/grub and insert </p>
<pre><code>intel_pstate=disable
</code></pre>
<p>after</p>
<pre><code>GRUB_CMDLINE_LINUX_DEFAULT=
</code></pre>
<p>like this example</p>
<pre><code>GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable quiet splash"
</code></pre>
<p>execute this command to apply the change to grub</p>
<pre><code>sudo update-grub
</code></pre>
<p>then, install indicator-cpufreq</p>
<pre><code>sudo apt-get update
sudo apt-get install indicator-cpufreq
</code></pre>
<p>reboot for your changes to take effect.</p>
<p>After you reboot, you will see an icon on your unity panel, click on
this icon and you can set the cpu to performance (full), ondemand (only
when needed), powersave, or conservative. </p>
<hr>
<p>Disabling pstate may not be necessary, you can try it on and off to
see if there is a difference. Make sure to update grub after making that
change.</p>
<p>Also, indicator-cpufreq will not allow changes with pstate on (only
with pstate disabled), you will still have to do that manually.</p>
<p>Finally, you can get better numbers from i7z:</p>
<pre><code>sudo apt-get install i7z
</code></pre>
<p>and then, run</p>
<pre><code>sudo i7z
</code></pre>
<hr>
<p>Install lm-sensors and run sensors detect:</p>
<pre><code>sudo apt-get install lm-sensors
sudo sensors-detect
</code></pre>
<p>Follow the prompts and select yes to everything.</p>
<hr>
<p>finally, these links may help:</p>
<p><a href="http://www.webupd8.org/2013/09/adobe-flash-player-hardware.html" rel="nofollow">http://www.webupd8.org/2013/09/adobe-flash-player-hardware.html</a></p>
<p>Not only does this allow hardware acceleration for flash but installs VDPAU and i965</p>
<p><a href="http://www.webupd8.org/2014/01/enable-hardware-acceleration-in-chrome.html" rel="nofollow">http://www.webupd8.org/2014/01/enable-hardware-acceleration-in-chrome.html</a></p>
<p>and these more recent benchmarks show a slight advantage from disabling pstate and using performance</p>
<p><a href="http://www.phoronix.com/scan.php?page=article&item=intel_5960x_pstate&num=2" rel="nofollow">http://www.phoronix.com/scan.php?page=article&item=intel_5960x_pstate&num=2</a></p>
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<a href="http://askubuntu.com/posts/591599/revisions" title="show all edits to this post">edited <span title="2015-03-02 05:15:26Z" class="relativetime">Mar 2 '15 at 5:15</span></a>
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answered <span title="2015-03-01 21:44:38Z" class="relativetime">Mar 1 '15 at 21:44</span>
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<span class="comment-copy">Thanks for i7z, it is a
better way to monitor cpu freq! I have enabled turbo through TLP,
disabled p-state, used performance governor (through TLP), but the CPU
is still "afraid" to spin up the fans. It's almost like there is a
temperature limit somewhere. In windows, if I enable full performance,
my laptop goes easily to 90C per core.</span>
– <a href="http://askubuntu.com/users/383839/matus201" title="21 reputation" class="comment-user owner">matus201</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822635_591599"><span title="2015-03-01 23:48:11Z" class="relativetime-clean">Mar 1 '15 at 23:48</span></a></span>
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<span class="comment-copy">@matus201 using performance
through tlp does not set the freq to performance, it allows performance.
If you want to set performance, you need to use some other method such
as <code>sudo cpupower frequency-set -g performance</code> or disable pstate and use indicator-cpufreq to set it to performance.</span>
– <a href="http://askubuntu.com/users/167115/mchid" title="14,861 reputation" class="comment-user">mchid</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822649_591599"><span title="2015-03-02 00:12:54Z" class="relativetime-clean">Mar 2 '15 at 0:12</span></a></span>
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<span class="comment-copy">@matus201 as suggested you
could try disabling thermald as a test but I wouldn't recommend it. Just
because the cpu gets hot doesn't mean you are actually getting any more
performance from it.</span>
– <a href="http://askubuntu.com/users/167115/mchid" title="14,861 reputation" class="comment-user">mchid</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822651_591599"><span title="2015-03-02 00:15:26Z" class="relativetime-clean">Mar 2 '15 at 0:15</span></a></span>
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<span class="comment-copy">I used the cpupower to set
governor to performance, and it seems to work in the sense that the
governor is performance. CPU frequency jumps to 3.5GHz when I task the
system; however, as soon as the fans spin a little bit up (on vaio fans
are controlled by bios), CPU is throttled to 800MHz. When they quiet
down, frequency jumps back to 3.5GHz, fans spin up, throttling happens
and so on... This makes watching simple 720p youtube video impossible
without dropped frames.</span>
– <a href="http://askubuntu.com/users/383839/matus201" title="21 reputation" class="comment-user owner">matus201</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822733_591599"><span title="2015-03-02 04:34:06Z" class="relativetime-clean">Mar 2 '15 at 4:34</span></a></span>
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<span class="comment-copy">I should mention that this
jumpy throttling happens with or without p-state (de-/activated through
grub). It makes me think this is a special case with VAIO laptops..</span>
– <a href="http://askubuntu.com/users/383839/matus201" title="21 reputation" class="comment-user owner">matus201</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment822737_591599"><span title="2015-03-02 04:40:40Z" class="relativetime-clean">Mar 2 '15 at 4:40</span></a></span>
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<p>I managed to figure this out. As usually, Sony decided to do things their way and so this is specific to Vaio laptops only.</p>
<p>To set full performance, you need to type in terminal:</p>
<pre><code>echo performance | sudo tee /sys/devices/platform/sony-laptop/thermal_control
</code></pre>
<p>This sets your laptop to performance mode, and no throttling happens.</p>
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