ASRock Forums : AB350 Pro4 BIOS Screen on Second GPU? https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 04 Jun 2026 15:33:11 +0000 Mon, 31 Jul 2017 03:03:48 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=5735 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[AB350 Pro4 BIOS Screen on Second GPU? : Right, which is why most BIOSes...]]> https://forum.asrock.com/forum_posts.asp?TID=5735&PID=33848&title=ab350-pro4-bios-screen-on-second-gpu#33848 Author: jstefanop
Subject: 5735
Posted: 31 Jul 2017 at 3:03am

Right, which is why most BIOSes have a selection on where to output initial video. ASROCK BIOS has no options at all. 


]]> Mon, 31 Jul 2017 03:03:48 +0000 https://forum.asrock.com/forum_posts.asp?TID=5735&PID=33848&title=ab350-pro4-bios-screen-on-second-gpu#33848 <![CDATA[AB350 Pro4 BIOS Screen on Second GPU? : jstefanop wrote:Hi, I have...]]> https://forum.asrock.com/forum_posts.asp?TID=5735&PID=33768&title=ab350-pro4-bios-screen-on-second-gpu#33768 Author: parsec
Subject: 5735
Posted: 29 Jul 2017 at 10:41am

Originally posted by jstefanop jstefanop wrote:

Hi, I have the AB350 Pro 4 Mobo, and whenever I plug in second GPU, the BIOS screen shows up on that GPU instead of the primary. I don't see any settings to select which slot UEFI BIOS is output on, but its annoying thats its not aways on the primary GPU. 

Is there a fix planned for this?


The video output that is used in the UEFI/BIOS is not controlled by a setting in the UEFI/BIOS.

How or why is one GPU designated as primary, and another as secondary? Simply by the PCIe slot being used?

In a PC with an iGPU and discrete GPU, which one is, or should be, the Primary?

Any monitor in a multi-monitor system can be selected as the Primary in Windows, and until we select one, which one becomes the default Primary monitor?

What happens if you have two monitors connected to one GPU? Which video output should be used as the Primary?

Not as straightforward a situation as we might think.

It's somewhat of a mystery to me which video card or video output is selected for the UEFI/BIOS UI, but it is likely related to the VBIOS in the GPUs.
]]> Sat, 29 Jul 2017 10:41:50 +0000 https://forum.asrock.com/forum_posts.asp?TID=5735&PID=33768&title=ab350-pro4-bios-screen-on-second-gpu#33768 <![CDATA[AB350 Pro4 BIOS Screen on Second GPU? : Hi, I have the AB350 Pro 4 Mobo,...]]> https://forum.asrock.com/forum_posts.asp?TID=5735&PID=33759&title=ab350-pro4-bios-screen-on-second-gpu#33759 Author: jstefanop
Subject: 5735
Posted: 29 Jul 2017 at 7:34am

Hi, I have the AB350 Pro 4 Mobo, and whenever I plug in second GPU, the BIOS screen shows up on that GPU instead of the primary. I don't see any settings to select which slot UEFI BIOS is output on, but its annoying thats its not aways on the primary GPU. 

Is there a fix planned for this?
]]> Sat, 29 Jul 2017 07:34:24 +0000 https://forum.asrock.com/forum_posts.asp?TID=5735&PID=33759&title=ab350-pro4-bios-screen-on-second-gpu#33759