gpu_metrics does not provide 'current_gfxclk', 'current_uclk', 'average_cpu_power' & 'temperature_core' on AMD Ryzen 7000 CPU

[Alex Deucher]

On Mon, Feb 6, 2023 at 9:22 AM sfrcorne <sfrcorne at protonmail.com> wrote:
>
> Hello,
>
> I hope this is the correct place to ask my question. I was not sure if I should have opened a new issue on Gitlab or send an email here, since I don't know know whether this is a bug or intended behaviour.
>
> The question is about the new AMD Ryzen 7000 CPU's. These new CPU's have an iGPU and consequently provide a gpu_metrics file for monitoring the GPU/CPU (APU?). This file is used by programs like Mangohud, that try to read (among other values) the following 4 values:
>  - current_gfxclk
>  - current_uclk
>  - average_cpu_power
>  - temperature_core
> However it appears that on AMD Ryzen 7000 CPU's these 4 values are not provided/updated in the gpu_metrics file. Other values like 'average_core_power', 'temperature_l3' and the other 'current_<x>clk' are also not provided/updated but these are not used by Mangohud at the moment.
>
> Is this intentional or a bug? And will this be fix and/or will support for these 4 values be added in the future?

What specific CPU/APU is this?  I don't recall off hand how mangohud
queries this stuff, but you can take a look at the hwmon interfaces
exposed by the driver or if you want the whole metrics table, you can
use umr to fetch and decode it via the kernel interface.  That will
allow you to verify that the firmware is producing the proper data.

Alex