Onboard gpu not disable when discrete gpu install, on auto setting in bios. clarification/why?

[tito]

Hello,

Need some help/clarification on bios settings.
I’ve been going back/forth for over a week with gigabyte support and cannot seem to understand it.
It’s about the integrated graphics section (see below) and the auto setting.

The “auto”, the way I understand and seems plenty clear in the documentation, is if an addon gpu is installed the onboard is disabled.
So, if onboard is still enabled when addon is installed and used, it looks like a bug.
There’s mention of “disable the onboard…” but the support team says it’s not going to be disable which then contradicts the documentation.

The support team keeps coming back (in bad english, so it’s hard to understand) that it’s something about priorities of display, of which, in my understanding, there’s another setting for gpu priorities. (see bellow, initial display output)

Help,

thanks.

---

Bios (x670e aorus master) says:

Initial Display Output
Specifies the first initiation of the monitor display from the installed PCI Express graphics card or the onboard
graphics.
IGD Video--------Sets the onboard graphics as the first display.
PCIe 1 Slot-------Sets the graphics card on the PCIEX16 slot as the first display.

Integrated Graphics
Enables or disables the onboard graphics function.
Auto------------The BIOS will automatically enable or disable the onboard graphics depending on the graphics card being installed.
Forces----------Enables the onboard graphics.
Disabled-------Disables the onboard graphics.

---

latest answer from support:

Dear customer,

MB manual states " DEPENDING ON THE GRAPHICS CARD BEEING INSTALLED " is could be the point on your confusion.

Onboard graphics will not be disable when set to auto. It will auto detection depends on if system has add on graphics card installed or not. When add on graphics card installed, bios will auto assign the add on as initial display first primary ( due to add on card has better performance ). Once add on card been auto detected as primary, integrated will function as secondary in case user connect second monitor to integrated that system has dual monitors.

User may disable onboard after system has add on graphics card installed but once add on graphics card defected user has no option to boot from integrated to troubleshoot.

If system only has single monitor connected, there has no point to disable integrated in bios.

This is is the bios was designed.

[Kougar]

The IGP is part of the X670 / B650 chipset itself, not part of the processor. Installing a discrete GPU does not disable the IGP, it’s function is to purely act as a backup video-out device. What the “AUTO” setting does is when the motherboard boots it searches for where the monitor is and then pipes the video out whichever port it’s on, switching between the IGP and the GPU as needed.

If you want to turn it off then you can do so manually, but if you disable it then the board will no longer automatically switch back to the IGP display-out ports if you remove the GPU. In the event your GPU died, you’d have to physically reset the CMOS before you could use the IGP display. This is why it’s handled this way.

“Initial Display Output” is used to tell the system if two monitors are detected then which one is the “main” display to prioritize. If you disable the IGP then this setting does nothing.

[Zedicus]

@Kougar

The IGP is part of the X670 / B650 chipset itself

not to split hairs, but the IGP is part of the IO Die, not the chipset.

@tito

it looks like a bug

it is a feature.
The IGP in ryzen 7000 is almost never actually disabled unless you manually set it disabled in BIOS. (and even then sometimes not) This is all mostly up to the BIOS implementation so kind of like ECC support, it varies wildly.

[Kougar]

@Zedicus

not to split hairs, but the IGP is part of the IO Die, not the chipset.

You’re right it’s an important distinction, I was not thinking about my word choice.

But yes, there’s no reason to disable it. In the random event one finds themselves without a GPU then it’s already too late to go into the UEFI and turn the “IGP” back on. And it’s so small that it’s not really even a proper IGP, this is not like AMD’s own APUs or Intel chips where it’s a full third or even two-thirds of the CPU silicon die and disabling those had real benefits.

[GTwannabe]

@Kougar

But yes, there’s no reason to disable it. In the random event one finds themselves without a GPU then it’s already too late to go into the UEFI and turn the “IGP” back on. And it’s so small that it’s not really even a proper IGP, this is not like AMD’s own APUs or Intel chips where it’s a full third or even two-thirds of the CPU silicon die and disabling those had real benefits.

Main benefit of disabling the IGP is getting rid of the half dozen or so Radeon Adrenalin services.

[Kougar]

You don’t need to install anything, the default windows driver should run it. I left the IGP enabled and I don’t have Radeon anything installed on my AM5 system.