ASRock Forums : Why can't I disable CSM on x399 Pro?? https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 15 Apr 2026 12:29:17 +0000 Fri, 20 Apr 2018 06:37:18 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=8440 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[Why can't I disable CSM on x399 Pro?? : Yeah no such switch on my card....]]> https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50098&title=why-cant-i-disable-csm-on-x399-pro#50098 Author: benetard
Subject: 8440
Posted: 20 Apr 2018 at 6:37am

Yeah no such switch on my card. According to EVGA all of their 1080s should support UEFI.

I just installed Windows and confirmed it is in UEFI mode in msinfo32.

I guess I will have to leave CSM On and leave video OPROM in Legacy mode.

Am I to understand that this prevents me from booting to an NVME RAID? Because that is something I want to do.


Edited by benetard - 20 Apr 2018 at 6:39am]]> Fri, 20 Apr 2018 06:37:18 +0000 https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50098&title=why-cant-i-disable-csm-on-x399-pro#50098 <![CDATA[Why can't I disable CSM on x399 Pro?? : nvidia 10xx doesnt have dual bios...]]> https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50083&title=why-cant-i-disable-csm-on-x399-pro#50083 Author: kerberos_20
Subject: 8440
Posted: 20 Apr 2018 at 4:35am

nvidia 10xx doesnt have dual bios witch switch
its all in one rom
my gtx 1060 is also unsupported in uefi mode, and ive tryed several bioses from different OEMs (GOP driver version seems to be same on all bioses so no wonder)
]]> Fri, 20 Apr 2018 04:35:04 +0000 https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50083&title=why-cant-i-disable-csm-on-x399-pro#50083 <![CDATA[Why can't I disable CSM on x399 Pro?? : bnetetard - I have an rx570 -...]]> https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50072&title=why-cant-i-disable-csm-on-x399-pro#50072 Author: scythefwd
Subject: 8440
Posted: 20 Apr 2018 at 2:16am

bnetetard - I have an rx570 - slightly older hardware of course.. but it has a switch on it to switch between bios and uefi 

I couldnt turn the csm off until I had flipped that switch.  I dont know your hardware, but may be something to look for.
]]> Fri, 20 Apr 2018 02:16:22 +0000 https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50072&title=why-cant-i-disable-csm-on-x399-pro#50072 <![CDATA[Why can't I disable CSM on x399 Pro?? : Weird thing is the debug LEDs...]]> https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50062&title=why-cant-i-disable-csm-on-x399-pro#50062 Author: benetard
Subject: 8440
Posted: 20 Apr 2018 at 1:06am

Weird thing is the debug LEDs turn off so I don't even know what error it is giving.]]> Fri, 20 Apr 2018 01:06:30 +0000 https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50062&title=why-cant-i-disable-csm-on-x399-pro#50062 <![CDATA[Why can't I disable CSM on x399 Pro?? : Maybe your issue is similar to...]]> https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50060&title=why-cant-i-disable-csm-on-x399-pro#50060 Author: JayB33
Subject: 8440
Posted: 20 Apr 2018 at 12:58am

[URL=][/URL]Maybe your issue is similar to the one in this thread:

http://forum.asrock.com/forum_posts.asp?TID=8356&title=x399-taichi-csm-bug-code-0e

In which case the original poster emailed ASRock but they didn't get back to him.

What error code do you get? I get 0E when I disable CSM + IOMMU, but I can turn off CSM on its own fine.

Edited by JayB33 - 20 Apr 2018 at 1:01am]]> Fri, 20 Apr 2018 00:58:48 +0000 https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50060&title=why-cant-i-disable-csm-on-x399-pro#50060 <![CDATA[Why can't I disable CSM on x399 Pro?? : Just put together a new system...]]> https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50057&title=why-cant-i-disable-csm-on-x399-pro#50057 Author: benetard
Subject: 8440
Posted: 20 Apr 2018 at 12:39am

Just put together a new system and it is booting up fine. The problem is if I disable CSM it won?™t POST. I?™ve narrowed it down to the Video Oprom setting. It will only boot if it is in legacy mode.


This is all brand new hardware so surely it should be able to go 100% UEFI. I?™ve seen others with this mobo who are disabling CSM just fine. I have a GTX 1080Ti and I don?™t understand why it needs legacy mode. Right now it is outputting HDMI to a Hisense 4K TV.


Specs:

ASRock x399 Professional Gaming

Threadripper 1950x

32GB G.Skill DDR4 PC3200

EVGA GTX 1080Ti SC2

3x Samsung 960 Pro 1TB M.2


(Please note this has absolutely nothing to do with Windows. I am not even to the point of installing an OS yet.)

]]> Fri, 20 Apr 2018 00:39:49 +0000 https://forum.asrock.com/forum_posts.asp?TID=8440&PID=50057&title=why-cant-i-disable-csm-on-x399-pro#50057