Strange boot issue

Help
1

I’ve recently installed NixOS on my laptop and have been getting a strange boot issue. Upon booting it goes through the process as normal but after all of the checks and passes scroll down the screen (I don’t know what that part is called) I get this black screen with a single white underline character in the top left corner which stays for a very long time. My keyboard light turns on but no input does anything until it somehow switches to the sddm login. Upon checking systemd-boot It says my boot time was only around 12 seconds so evidently it’s not part of systemd. I’ve had issues with boot times on the ublue aurora image so it might be a hardware quirk of my laptop.

System specs:

Operating System: NixOS 25.11
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
Kernel Version: 6.16.0 (64-bit)
Graphics Platform: Wayland
Processors: 22 × Intel® Core™ Ultra 7 155H
Memory: 16 GiB of RAM (15.0 GiB usable)
Graphics Processor: Intel® Arc
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ASUS Zenbook 14 UX3405MA_Q425MA
System Version: 1.0

Configuration: NixOS configuration - Pastebin.com

2

Hello
This black-screen is most likely your graphics driver starting up. To verify this look at the last line before the black-screen appears. But this black-screen is completely normal in the boot-up.
To see how long each service took to boot you can run the command systemd-analyze blame.

3

What’s weird is that it doesn’t show on systemd-analyze blame at all. It takes what feels like a minute but there’s no real “evidence” it happened.

4

Hello, is your fastboot on if yes try turning it off

5

Unfortunately that doesn’t seem to have fixed the issue.