AMD Motherboards - B550M Pro4 - No C-State Information

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B550M Pro4 - No C-State Information

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=35811
Printed Date: 29 Oct 2025 at 12:21pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B550M Pro4 - No C-State Information

Posted By: crypticfish
Subject: B550M Pro4 - No C-State Information
Date Posted: 29 Apr 2024 at 4:52am

Hey all,

I am trying to build a home server around a Ryzen 5 Pro 4650G an a AsRock B550M Pro4 motherboard. I am currently running it with Ubuntu 22.04.4 LTS to do some testing, specifically relating to the powerdraw of the system.

My issue is the following:

I have noticed that running powertop does not give me any C State information in the `Idle stats` tab. (I can try to upload a screenshot if that is relevant)

I have not seen this behavior on my other Ryzen based system or any screenshot on the web. This is leading me to believe that C-States are not enabled. I have clicked through the BIOS (version B550M Pro4 P2.80) and can't seem to find a relevant setting. https://download.asrock.com/Manual/B550M%20Pro4.pdf" rel="nofollow - The manual does not appear to mention C-States at all.

Does anyone have an idea on how I could further diagnose this or on which setting in the bios I might have overlooked?