https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Tue, 23 Jun 2026 12:06:20 +0000 Wed, 21 Nov 2018 02:54:55 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=10214 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=10214&PID=58079&title=h170m-pro4-simultaneous-igpu-and-discrete-graphics#58079 Author: keeka
Subject: 10214
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?
]]> Wed, 21 Nov 2018 02:54:55 +0000 https://forum.asrock.com/forum_posts.asp?TID=10214&PID=58079&title=h170m-pro4-simultaneous-igpu-and-discrete-graphics#58079 https://forum.asrock.com/forum_posts.asp?TID=10214&PID=58040&title=h170m-pro4-simultaneous-igpu-and-discrete-graphics#58040 Author: keeka
Subject: 10214
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.
]]> Tue, 20 Nov 2018 06:56:42 +0000 https://forum.asrock.com/forum_posts.asp?TID=10214&PID=58040&title=h170m-pro4-simultaneous-igpu-and-discrete-graphics#58040