cachyos-drm-awaiter: New package

[ventureoo]

It's working pretty simple, we supply systemd generator which generates drm-module-load.target in early boot time, which is guessing all necessary GPU drivers and injecting dependency to them for units that are using graphics at boot process, that is getty with autostart of some environment or display manager. This should spare us from including GPU modules in initramfs images, which makes them very bloated. On my machine with two GPUs initramfs-linux-cachyos.img currently takes 252 MiBs per-kernel, and I don't find this acceptable. After removing early kms, it takes only 17 Mb, that's significant saving.

See CachyOS/chwd#236 for more details.

[Copilot]

Pull request overview

Adds a package that delays graphical services until detected DRM modules load, reducing initramfs size.

Changes:

• Adds a systemd generator for GPU module detection and ordering.
• Adds udev rules for module tracking and SimpleDRM handoff.
• Adds Arch package metadata and installation rules.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
cachyos-drm-awaiter/PKGBUILD	Packages the generator and udev rules.
cachyos-drm-awaiter/drm-module-awaiter-generator	Generates DRM module dependencies during boot.
cachyos-drm-awaiter/30-drm-awaiter.rules	Tracks DRM modules and handles SimpleDRM.
cachyos-drm-awaiter/.SRCINFO	Provides generated package metadata.

Suppressed comments (2)

cachyos-drm-awaiter/drm-module-awaiter-generator:66

• Comparing a concrete modalias prefix against modinfo's wildcard alias text is not alias matching. For example, Nouveau exposes aliases such as pci:v000010DEd*..., which cannot contain the concrete device prefix stored here, so Nouveau is omitted; other wildcard aliases are affected too. Preserve the full sysfs modalias and resolve it with modprobe --resolve-alias, then check for this exact module name.

    modinfo "$module" 2>/dev/null | grep -q "$modalias" || return 1

cachyos-drm-awaiter/drm-module-awaiter-generator:109

• On an NVIDIA-only system, modules is still empty here because nvidia_module is appended below, so the generator returns without creating any synchronization target. The linked chwd NVIDIA profiles install this package while removing the initramfs module list, making this path essential. Add NVIDIA before the empty check and ensure the single-GPU path actively loads nvidia_drm; loading the core nvidia module alone does not pull it in, so merely moving the append would otherwise cause a 10-second timeout.

    if [ -z "${modules[0]}" ]; then
        return 0
    fi

    if [ -n "$nvidia_module" ]; then

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[ventureoo]

I find this extremely unlikely, besides the same rule is used in Ubuntu and I haven't seen any bugs related with it.