No CPU power report in HW monitoring overlay

[TheGeekno72]

Is there an existing issue for this?

• I have searched the existing issues

Are you using any gamescope patches or a forked version of gamescope?

• The issue occurs on upstream gamescope without any modifications

Current Behavior

Hi there,

Happy new year and best wishes to everyone on the team as well as anyone else reading!

I am a new user to SteamOS, having built my own custom system recently, installed SteamOS which I diverted from the 3.7 stable to the 3.9-main updates and noticed a little something while trying out the hardware monitoring: CPU power is showing 0W at all times?

The 9600X comes with an iGPU, which would correspond to "GPU1", which does have power monitoring but I don't know this tool well and wouldn't assume the exposed value to be the whole CPU package's draw.

I did go in BIOS and enabled the "dGPU only mode" (which disables iGPU when a dGPU is detected on the system) to see if, by some sort of weird magic trick, it would change anything: no can do, GPU1 is gone but CPU doesn't show any more power draw than it did the first time around!

I saw some reddit post with a weird fix I tried to apply but didn't get very far; the package mentioned there wouldn't download for some reason and I saw there wasn't an open issue mentioning this so here I am with my DIY Machine, if any more information is required, I am more than willing to provide whatever you need. (Note: I did not try to use it in desktop mode, only gaming mode/Big Picture)

Steps To Reproduce

Enable system monitoring (be it in game or in main menu) and it would be showing 0W

Hardware information

- Distro: SteamOS 3.9-main [build 20251218.1000]
- CPU: AMD Ryzen 5 9600X
- GPU: PowerColor Reaper Radeon RX9060XT 16GB
- Driver Version: Mesa 25.3.0

Software information

- Desktop environment: whichever ships in [build 20251218.1000]
- Session type: N/A
- Gamescope version: whichever ships in [build 20251218.1000]
- Gamescope launch command(s): none, just whatever is done to show performance overlay in Gaming Mode

Which gamescope backends have the issue you are reporting?

• Wayland (default for nested gamescope)
• DRM (default for embedded gamescope, i.e. gamescope-session)
• SDL
• OpenVR

Logging, screenshots, or anything else

[kisak-valve]

Possible duplicate of #2230.

[TheGeekno72]

Possible duplicate of #2230.

oh, huh.

not a duplicate, honest mistake, I looked up if there was an open issue with "CPU power" keywords, guess it didn't want to show me that one unless I used wattage in my search, my bad

[matte-schwartz]

actually, I expect this is a different issue.

from what I understand, MangoHUD needs additional permissions to read CPU power from Zen4/Zen5 CPUs:

Note: RAPL is currently used for Intel and AMD Zen CPUs to show power draw with cpu_power which may be unreadable for non-root users due to vulnerability. The corresponding energy_uj file has to be readable by corresponding user, e.g. by running chmod o+r /sys/class/powercap/intel-rapl:0/energy_uj as root, else the power shown will be 0 W, though having the file readable may potentially be a security vulnerability persisting until system reboots.

from https://github.com/flightlessmango/MangoHud/blob/master/README.md

if anything, this is a duplicate of #2104

AMD APUs should not require this under normal circumstances, but this system has a dGPU and CPU.