Ubuntu: XPS 15 stuck on 800MHz



Question:

I'm running Ubuntu 16.04 with CPU: i7-6700. Even with one of the cores sitting on 100% utilisation cpufreq-info reports.

...  analyzing CPU 7:    driver: intel_pstate    CPUs which run at the same hardware frequency: 7    CPUs which need to have their frequency coordinated by software: 7    maximum transition latency: 0.97 ms.    hardware limits: 800 MHz - 3.50 GHz    available cpufreq governors: performance, powersave    current policy: frequency should be within 800 MHz and 3.50 GHz.                    The governor "performance" may decide which speed to use                    within this range.    current CPU frequency is 800 MHz.  

Each CPU shows 800 MHz. How do I get my CPU frequency to increase under load?


Solution:1

Thanks for the suggestions. It seems to be an issue that a few have come up against where the processor gets stuck in a throttled state. I've tried the suggested solution of removing the battery and it is now running at full speed again. Unfortunately this has the effect of clearing other bios settings. This was on a Dell XPS 9550.


Solution:2

It's possible that it is a hardware problem: the BIOS may limit CPU speed for various reasons, including overheating or perhaps even a loose connector for a fan, a temperature sensor or a chassis intrusion sensor. Whether or not it can do that depends on the manufacturer, most likely. Anyway, Enhanced SpeedStep should be able to function independently from any CPU frequency governor. Maybe it's just reading it wrong. Does the computer feel excessively sluggish to you? If not it may well be working properly. Perhaps it's a good idea to cross-check by running "lscpu" in the terminal, and see what it has to say about current speed.


Solution:3

As a temporary solution, I do following: sudo -i for x in /sys/devices/system/cpu/cpu[0-3]/cpufreq; do echo 3400000 > $x/scaling_max_freq; done for x in /sys/devices/system/cpu/cpu[0-3]/cpufreq; do echo 2700000 > $x/scaling_min_freq; done

After that i do reinserting power (remove - insert), and then frequency increases higher than 800 MHz.


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