System details
- Omarchy ISO versions: 4.0.1 and 4.0.2 (reproduced on both)
- Motherboard: ASRock B650M Pro RS WiFi
- GPU: NVIDIA GeForce RTX 4080 SUPER
- Current NVIDIA driver: nvidia-open-dkms 610.57.04-1
- Current kernel: 7.1.9-arch1-2
- Display setup: one monitor connected over DisplayPort
What's wrong?
When booting the Omarchy ISO, the machine appeared to boot to a completely
black screen every time.
After trying several USB drives and numerous suggested UEFI/BIOS changes, I
discovered that the live installer was displaying through DP-1 even though my
only monitor was connected to DP-3. There was no monitor connected to DP-1 and
no visible indication that the ISO had booted successfully.
Moving the DisplayPort cable from DP-3 to DP-1 immediately revealed the running
installer and allowed installation to continue.
Steps to reproduce
- Connect a single monitor to DP-3 on the NVIDIA GPU.
- Leave DP-1 disconnected.
- Boot the Omarchy installation ISO.
- Observe that the connected monitor remains black.
- Move the same cable from DP-3 to DP-1.
- Observe that the already-running installer becomes visible.
Expected behavior
The live environment should detect which output has a connected monitor and
display the installer there. With only one monitor connected, the installer
should not select an unconnected output.
Actual behavior
The installer selected DP-1 while the only monitor was connected to DP-3,
making a successfully booted ISO appear to have failed with a black screen.
Additional comparison
The same computer and display connection work correctly with other installer
ISOs, including CachyOS. CachyOS detects the single monitor on DP-3 and displays
its installer there without requiring the cable to be moved.
Impact
This failure is indistinguishable from an ISO, USB-drive, firmware, or GPU boot
problem. It led to hours of unnecessary troubleshooting and repeated USB-media
creation before the output-selection issue was discovered.
Filed by GPT-5 via Codex.
System details
What's wrong?
When booting the Omarchy ISO, the machine appeared to boot to a completely
black screen every time.
After trying several USB drives and numerous suggested UEFI/BIOS changes, I
discovered that the live installer was displaying through DP-1 even though my
only monitor was connected to DP-3. There was no monitor connected to DP-1 and
no visible indication that the ISO had booted successfully.
Moving the DisplayPort cable from DP-3 to DP-1 immediately revealed the running
installer and allowed installation to continue.
Steps to reproduce
Expected behavior
The live environment should detect which output has a connected monitor and
display the installer there. With only one monitor connected, the installer
should not select an unconnected output.
Actual behavior
The installer selected DP-1 while the only monitor was connected to DP-3,
making a successfully booted ISO appear to have failed with a black screen.
Additional comparison
The same computer and display connection work correctly with other installer
ISOs, including CachyOS. CachyOS detects the single monitor on DP-3 and displays
its installer there without requiring the cable to be moved.
Impact
This failure is indistinguishable from an ISO, USB-drive, firmware, or GPU boot
problem. It led to hours of unnecessary troubleshooting and repeated USB-media
creation before the output-selection issue was discovered.
Filed by GPT-5 via Codex.