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I have a Samsung NP530 ultrabook and it run very hot and loud when the IGP is in use (eg. on Google maps with 3D building, etc...).

I don't need a lot of power and I prefer when I work in silence so I already activate Powersave governor for the CPU and limit its frequency to 800Mhz. Even with a high CPU load it keep cool but I didn't find anything to keep cool the GPU (HD 4000).

So is it possible to underclock or set a frequency to Intel HD 2/3/4000 (IGP) to keep it cool ?

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Sorry for not having seen this before but I wrote an article on how to play with GPU frequencies on that laptop Playing with the GPU frequencies on a Samsung NP530-U3C

short extract:

sudo su
echo 350 > /sys/kernel/debug/dri/0/i915_max_freq

will reduce the max GPU speed to 350Mhz, the lowest speed

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Thank you very much, I will try that ! – user117506 Feb 3 '15 at 12:40
cool very cool :) – Postadelmaga Jul 10 at 16:00

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