Description

This essentially refers to Ubuntu 16.04 and the A10-7850K, where it was throttling at 3.7GHz, due to the Radeon drivers.

Testing

Terminal 1:

sudo modprobe msr
sudo cpufreq-aperf

Terminal 2:

stressapptest -W -M 12000

If it only goes up to 37xx MHz on Terminal 1, then it's restricted, it should go up to 38xx Mhz or even 39xx MHz.

Solution

This may affect GPU performance, but the steps are:

1. Edit the default Grub file:

sudo nano /etc/default/grub

2. Find the line with GRUB_CMDLINE_LINUX_DEFAULT and add the option radeon.dpm=0, e.g.:

GRUB_CMDLINE_LINUX_DEFAULT="radeon.dpm=0"

3. Update Grub:

sudo update-grub