the idea is only to make sure that motherboard video adapter is enabled - connect the screen to it - and yes, check if installer will pass (so not disabling 5090)
also in my early notes, it may be applicable to 5090 as well, i don’t remember if this worked actually , but maximum damage is that you damage the installer that you can re-write again, it’s been a long time since ubuntu is recognizing 4090 well.
The idea: “Using nomodeset prevents early graphics mode-setting before the correct NVIDIA driver is installed.”
if the installer goes black after GRUB then at the Ubuntu installer boot menu:
- Highlight "Try or Install Ubuntu Server" (or whatever is the option).
- Press e.
- Find the line beginning with linux.
- Add before the final ---: “nomodeset nouveau.modeset=0”
For example:
linux /casper/vmlinuz … nomodeset nouveau.modeset=0 ---
Boot with Ctrl+X or F10.
last resort may be to remove 5090 , install ubuntu, and put 5090 back, but i’m sure there must be elegant ways to overcome this black sreen.
I don’t have more ideas, if none of the scenarios worked - you may want to reach out to audiophilestyle community there are threads on linux and hqplayer, I’m 100% sure you are not the only one with 5090 going to embedded. so issue must be known, unless this is a card deffect, which I doubt , since you enjoyed your card for a while while already…