AMD Motherboards - CSM keeps enabling after cold start

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CSM keeps enabling after cold start

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=95961
Printed Date: 18 Jul 2025 at 9:05am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: CSM keeps enabling after cold start

Posted By: andrewc
Subject: CSM keeps enabling after cold start
Date Posted: 07 Feb 2025 at 9:41am

I have a Steel Legend B450 motherboard. I tried to disable CSM and enable secure boot. It works fine and I can boot into Windows 11. However, whenever I shutdown the computer and restart 20 minutes later, CSM will enabled automagically and secure is disabled because of that. If I reboot the computer without cutting off the power, the CSM and secure boot setting will remain the same. I don't think there is any issue with the bios battery as all the other settings in the bios did not reset to default.

I have tried to update the bios to 4.6 and 10.08, that didn't fix the issue. I have checked that my GPU card supports UEFI. I have swapped the keyboard and mouse. I have tried unplugging the network card and headset. So I don't think there is any legacy device that might have caused the CSM to re-enable by itself.

Replies:

Posted By: eccential
Date Posted: 09 Feb 2025 at 9:47pm

Check RTC/CMOS battery voltage?