Display not detecting Aorus RTX 3090 from cold boot

[Ryan0655]

I have this weird issue that's happened since swapping out a 2080Ti to a 3090. My PC is connected to a Samsung Q95T, which, when I boot up won't see the PC. You can tell the PC has gone to Windows start though - just not putting out anything on HDMI. However, if I switch the PSU off and on and then reboot, it picks up the card fine. It also works fine when just restarting the PC.

What is different from a boot where the power was completely off to one where the PC is off but PSU is on?

 

[Ryan0655]

It's a True HQ one from Amazon, which has good reviews for being 2.1 compliant. I have a spare one so will try that to see what happens.

 

[Ryan0655]

That's really interesting you have had the same issue. I think because there are not many of these cards out there with people using a TV, not many are reporting issues. I think you are right in that it's a handshake issue between the TV and card when using 120hz 4k 4:4:4. Mine works flawlessly too when in Windows so I'm hoping there will be a fix via drivers or TV firmware update. I can work around it at the moment.

 

[Ryan0655]

I've since changed to an ASRock B550 board and still the same issue (works perfect using HDMI 2.0) so I think there is some kind of firmware update needed. As it's happening to other TV sets and not just Samsung, it looks like a card issue rather than the display, but perhaps all the TVs use the same chipset. I'm not too bothered at the moment - I don't really see any difference when running at 120Hz 4k than 60Hz to be honest. I'd like to see a fix at some point though.

 

[Ryan0655]

I think I just found the reason/ the solution!

There is a Windows 10 Fast Startup option, which is normaly turned on. I was not aware of this. (just google it, to find it)
Turn it off!
At least my machine boots everytime like it should now.

Maybe UEFI Fastboot + Windows Fastboot is too fast for a proper HDMI 4K 120Hz G-Sync handshake.

That worked for me too! Top work! How did you find that out?

 

[Ryan0655]

Haha wow that fixed the issue straight away, that problem has been hacking me off for weeks now! Thanks v much!!

Good to hear! It's a shame the solution isn't more obvious!