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Long time multi monitor problem with iGPU that I can't seem to fix.

Level 9

Motherboard is the ROG STRIX Z690-A GAMING WIFI D4 and I'm using the latest bios (3401).

I have the following monitors:

1x VG27AQL1A connected to iGPU with DP

1x GM001J connected to 4090 with HDMI 

1x GP950-B connected to 4090 with DP

1x AW3225QF connected to 4090 with DP

I have iGPU multi monitor enabled in the BIOS, and I've set the primary display to PEG. When I start the system, the BIOS loads on the iGPU display and the 4090 display that's plugged into the furthest DP port on the right (AW3225QF). When I boot into Windows, the 4090 is seemingly disabled for 10-15 seconds and I only get display on the iGPU. After that time, the 4090 is enabled and all my monitors work as they should. 

I've tried installing the latest intel drivers hoping that'd fix something, but every driver version beyond the one on my motherboards support page actually causes my monitors to no longer wake from sleep properly in addition to the boot problem, so I'm still using 

If I disable the iGPU completely, I have no issues, but I can't connect all 4 monitors to my 4090 because of DSC limitations. 


Level 17

Mad idea - if you have a monitor that supports it, could you daisy chain 2 monitors using a single display port on the GPU? Then you could leave the iGPU disabled and still have 4 monitors. 

Z690 Hero, 12900K, BIOS 3501, MEI 2406.5.5.0, ME Firmware, 7000X Case, RM1000x PSU, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 23H2, Corsair H150i Elite AIO, 4x Corsair RGB fans, 3x M.2 NVME drives, 2x SATA SSDs, 2x SATA HDs.

Unfortunately, none of my monitors support daisy chaining. 

Level 9

Ok, just so I'm clear, do you mean the displays attached to your discreet GPU are black during the Windows login screen, and then come alive when you're logged in? Or they stay dark until after login for a period of time?

Are you on Windows 10 or 11, and which version?

Based on your config, I don't believe that you need to have iGPU multi monitor enabled since you are only using one output, have you tried it with that disabled? Any difference? That should make your choice of primary display device actually stick instead of having the UEFI prompts on both adapters.

Let me know. 🙂 

Hisense U7G 55" 4K, HDR, 120hz w/FreeSync VRR Primary Display
Corsair 5000X Black iCue, ROG STRIX Z690-E GAMING WIFI w/ Intel 12700K, AIO Cooled by Corsair H150i Elite Capellix, Gigabyte Aorus Master RTX 3080 Ti, 32GB (2x16) Corsair Dominator Platinum @ XMP I, 4x 1TB WD850 Black NVMe, 2x on HyperCard in Raid 0, and 2x in M2.2 and M2.3 on Mobo.
SeaSonic TX1000W Platinum PSU, Corsair K70 RGB MK2 Wired Keyboard, Corsair M65 RGB Ultra Wired Mouse, Logitech Brio 4K w/Windows Hello Face. Windows 11 Pro Insider 26100.1 (24H2)

I'm using Windows 11 23H2, but it also happens on my install of 22H2 and 24H2. When I get to the login screen, all displays connected to my 4090 are disabled and have no signal. When I check display settings, the displays are detected, just set to "Disconnect this display". If I do nothing, the displays are automatically enabled after 10-15 seconds, but manually extending the desktop to the disconnected monitors works too. Also, I tried turning iGPU multi monitor off but it didn't make a difference. 

Level 9


Ok so the actual problem seems to occur only when 3 monitors are connected to the I decided to just plug the GP950-B into my iGPU as well, so now my setup looks like this:

1x VG27AQL1A connected to iGPU with DP @144hz (could not get 144hz with the latest intel driver or even the latest driver on my motherboards support page. I had to downgrade all the way back to and then use CRU to add the custom 1440p 144hz resolution. 

1x GM001J connected to 4090 with HDMI @144hz (only goes to 144hz with HDMI 2.1 despite being the full 48gbps. Seems to be a bug with Nvidia cards only. I don't use DP because of black screen issues caused by DSC on this monitor). 

1x GP950-B connected to iGPU with DP @ 144hz but 160hz does work surprisingly. Don't have a need for 160hz on a side monitor though. 

1x AW3225QF connected to 4090 with DP @ 240hz (no blackscreen issues on this monitor with DP and my 4090 only has one HDMI slot) 

So TLDR; 3 monitors connected to 4090 + 1 monitor connected to iGPU causes an error somewhere when cold booting. All intel drivers past also suck apparently. 

Anyway thanks for the suggestions, and hopefully this helps someone else down the road.