Dear Qubes Community, I hope this message finds you well. I am a new Qubes OS user, and I have been trying to install Qubes OS 4.3.1 on my hardware over the past few days. I have read the official documentation and many community threads, but I am currently stuck and would really appreciate your gu…

Sir, I kindly ask you to carefully think through the installation steps. I know you are a Qubes expert. I have tried every possible approach and I am at my wit’s end. Could you please teach me how to get past this issue

I too think that your Qubes installation somehow choose NVIDIA as primary GPU. So, the next thing I would try is to pull it out temporarily and try to install Qubes on Auto/PCIE first. When that successes, then installing drivers (when they are available) and hide it from dom0 with rd.qubes.hide_pc…

Can you remove the 4090, install qubes and then reinstall 4090 (with the grub flag to dom0 ignore the 4090). This is what I did with my amd (CPU and discrete gpu) qubes machine

Your meaning is to first unplug the 4090 power socket, then install the Qubes system, and after installation is complete, reinsert the 4090 power cable, right? After installation, it seems I need to make dom0 ignore this 4090, correct? Do you still have the command to ignore the 4090 graphics card i…

After removing the 4090, shouldn’t the Primary Display be changed to CPU Graphics? These two options, Auto and PCIE, aren’t PCIE used for graphics card pass-through? In addition, can the command steps be more specific? I think what you have tested should be more accurate than AI. AI seems not to be…

See also: [image] [qubes-users] Qubes 4.3.1 installation black screen (RTX 4090) – ASUS Z790 iGPU + GPU passthrough setup qubes-users Dear Qubes Community, I hope this message finds you well. I am a new Qubes OS user, and I have been trying to install Qubes O…

[image] anon52953950: first unplug the 4090 power socket I do not know the 4090, but I recommend- Turn off computer Disconnect from power & wait 3 minutes. Unplug power and remove the card completely from the motherboard. From experience, at least some GPU work OK with no power connector, …

[image] anon52953950: Your meaning is to first unplug the 4090 power socket, then install the Qubes system, and after installation On my desktop, just pulling the 4090 would create a non booting issue. I had to remove the GPU from the pci slot. The grub command to hide it is here (the first …

I have similar hardware and ran into the same issue. The culprit is X11 not choosing the correct GPU to display the output with, it chooses the Nvidia GPU as primary by default. I couldn’t figure out why this happens even when the GPU is hidden via rd.qubes.hide_pci. What solves the problem for me…

Qubes 4.3.1 installation black screen (RTX 4090) – ASUS Z790 iGPU + GPU passthrough setup

User Support Hardware Issues

ChrisA August 3, 2026, 1:28pm 10