Display doesn't show BIOS but HDMI does

Nutty_Death · 8 Aug 2020 at 17:46

Weird issue.
I've got a new motherboard and I can only see the bios when using HDMI, not displayport.
However once it gets to Windows then displayport works fine.

Kinda annoying and i'm not sure why?

Nutty_Death · 8 Aug 2020 at 18:17

It worked fine with my previous motherboard which makes me think it's motherboard related.

It's a dual screen setup. One displayport, one hdmi. Neither show when displayport in. Hdmi shows when displayport out.
Previously this worked fine.

I'll try swapping cables like you said to see what happens

Nutty_Death · 8 Aug 2020 at 18:20

This article is interesting https://linustechtips.com/main/topic/663941-post-screenbios-doesnt-display-with-displayport/

Previously I think I may have had CRM selected for whatever reason rather than uefi. I'll see if that makes a difference.

Then there's this https://www.nvidia.com/en-us/drivers/nv-uefi-update-x64/
I'll try that too.

Nutty_Death · 8 Aug 2020 at 19:19

Sorry for the multiple replies to myself.

Running "NVIDIA GRAPHICS FIRMWARE UPDATE TOOL FOR DISPLAYPORT 1.3 AND 1.4 DISPLAYS" fixed it.

Being in CRM mode instead of uefi must have made it work previously.

For reference I'm running a Nvidia 1070.

Nutty_Death · 9 Aug 2020 at 04:38

Did you download the tool to see whether it recognises your card as requiring an upgrade? You can can cancel before it does anything.

I believe it edits and flashes the part of your firmware that manages displayport but only after it validates your card.

Nutty_Death · 15 Sep 2020 at 19:15

Destination said:
I have exactly the same issue, didn't even realise it until I went to review BIOS settings several weeks after I swapped monitor
Windows works fine, but booting into BIOS simple displays a flashing cursor
I don't have an nvidia card, I've an Rx 580.
On a x570 tomahawk , advice please as I don't have another monitor to swap to easily.
Anything people would suggest?

Use a HDMI cable instead of displayport maybe