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Против Глобал
Asked: 2018-07-22 09:54:54 +0800 CST

How to change "scaling_max_freq" file (set max frequency higher)?

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I have AMD A6-7310 which supports boost clock of 2.4 GHz. But, in Ubuntu 18.04, it only goes to 2.0 GHz.

If I go to: /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq and open that file, it shows "2000000" (2 GHz). I want to change that (on all 4 cores/files) to "2400000" (2.4 GHz), but I can not save the changes.

How can I do this? How can I change this file?

I still want to have automatic scalling, as it is now, but to go to the max supported frequency.

I have also tried this: Set CPU governor to performance in 18.04 But no changes.

scaling frequency

1 Answers

  1. From: http://laptopmedia.com/processor/amd-a6-7310/

    AMD A6-7310 is a 4 core, entry-level processor announced in Q2 of 2015. It is part of AMD’s “Carrizo-L” architecture family and operates at a base frequency of 2.0GHz. If a higher frequency is needed, its cores can overclock to 2.4 GHz thanks to the TurboCore functionality.

    I don't have an AMD CPU to give exact instructions, but you need to enable TurboCore just like TurboBoost needs to be enabled for Intel platforms:

    echo "0" | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo
    • This enables turbo boost.

    and

    echo "1" | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo
    • This disables turbo boost.

    Further reading:

    From How to set up a Debian system (focus on 2D or console/server) with an AMD Turbo Core APU for maximum energy and computing efficiency?, you need to install Radeon driver. Most likely you need to append radeon.bapm=1 to the value of GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and run sudo update-grub

    :

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