Intel Motherboards - H170M Pro4 simultaneous iGPU and discrete graphics

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H170M Pro4 simultaneous iGPU and discrete graphics

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=10214
Printed Date: 06 Aug 2025 at 12:54pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: H170M Pro4 simultaneous iGPU and discrete graphics

Posted By: keeka
Subject: H170M Pro4 simultaneous iGPU and discrete graphics
Date Posted: 20 Nov 2018 at 6:56am

Motherboard: H170M Pro4
CPU: i5-6600
PCIe graphics: RX 580

BIOS settings:
Primary graphics adapter = onboard
Share memory = 128mb (also tried auto)
IGPU multi monitor = enabled

Whatever settings I try, the RX580 discrete graphics seems to become the primary display. i.e. where uefi bios will appear, if activated, and any os/bootloader screen appears.
I am attempting vifo passthrough of the discrete graphics, and this works only IF I plug a monitor into the rx580 once at ubuntu desktop. Otherwise, ubuntu kernel attempts to use the discrete card (blacklisted) at boot and the console freezes. Not locked up, since I can shutdown via ssh.

So,how do I actually make the iGPU the primary graphics adapter when I also have a PCIe graphics card plugged in to a monitor?
Grateful for any help.

Replies:

Posted By: keeka
Date Posted: 21 Nov 2018 at 2:54am

Putting it another way. What is the intended behaviour of this motherboard/uefi when you have a PCIe graphics card as well as onboard graphics enabled AND set primary graphics to 'Onboard'?
Shouldn't the UEFI appear on display connected to the intel graphics?