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I don't know the exact reason, but whenever I'm watching a video (doesn't matter if it's Youtube or VLC), after some minutes (twenty or so), my CPU usage spikes to 100%. I've been trying to see what is exactly causing it, and the only thing to blame seems to be some processes called kidle_inject:[RANDOM NUMBER]. Now, I've been looking through the internet and it seems it's just some sort of thermal controller for Intel. I'm not sure what's going on out there, but it makes the computer completely unusable. I don't remember experiencing this before. Maybe it's a system update that introduced a bug, I don't know, but is getting really frustrating.

My laptop is a Lenovo T430, with 8 GB of RAM, Intel Core i5 (Haswell, I think), Intel HD Graphics 4000 and a screen resolution of 1600x900.

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  • Do you have intel-related tools installed like Powertop? No specific reason for asking, but any info is welcomed... – Aleksandar Stefanović Mar 21 '16 at 22:06
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open a terminal and the command sudo rmmod intel_powerclamp will remove the powerclamp module from your running system. If that fixes it, you can can enter the following in a terminal

cd /etc/modprobe.d sudo su echo install intel_powerclamp /bin/true > intel_powerclamp.conf

to stop it loading when your system restarts.

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If andrew's solution didn't work, make sure that you got your video drivers installed properly, or your system might run in software-rendering mode, because then your video will be rendered via CPU.

You can also check that with:

glxinfo | grep OpenGL

Take a look at Direct Rendering, if it says no, your CPU is rendering everything.

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