Description of Changes

1. Graphical boot config overhaul:
   • Added more nix options to configure Ghaf graphical boot: theme, renderer, splashDelay, deviceTimeout, debug
2. Enabled graphical boot on guivm
   • The splash screen should show up as soon as the gpu is attached and initialized on guivm
3. Fixed black screen boot on system76 darp11-b

Type of Change

• New Feature
• Bug Fix
• Improvement / Refactor

Related Issues / Tickets

Checklist

• Clear summary in PR description
• Detailed and meaningful commit message(s)
• Commits are logically organized and squashed if appropriate
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• Author has run make-checks and it passes
• All automatic GitHub Action checks pass - see actions
• Author has added reviewers and removed PR draft status

Testing Instructions

Applicable Targets

• Orin AGX aarch64
• Orin NX aarch64
• Lenovo X1 x86_64
• Dell Latitude x86_64
• System 76 x86_64

Installation Method

• Requires full re-installation
• Can be updated with nixos-rebuild ... switch
• Other:

Test Steps To Verify:

1. Shutdown the target system after deploying this patch
2. Power on the system
3. Observe and verify the following boot process:
   • Firmware/NixOS generation selection
   • Host boot splash screen with Ghaf logo
   • Black screen (guivm started, gpu is being initialized)
   • Guivm boot splash screen with Ghaf logo
   • Black screen (greetd starting)
   • Login screen
4. Verify boot process is fixed on system76 darp11-b