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punktfunk/crates
enricobuehler e5166c6e6e
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fix(host/steam): load vhci_hcd at boot on sysext hosts so the Deck pad is Steam-Input-promotable
The virtual Steam Deck pad only appears in the host's Game Mode (and is
navigable) when it arrives as a real USB device via the usbip/vhci_hcd
transport — Steam Input won't promote the UHID hid-steam fallback
(Interface: -1). The host runs as an unprivileged --user service, so it
cannot modprobe vhci_hcd itself; the module must be loaded at boot and the
vhci attach/detach sysfs files chgrp'd to the `input` group by the udev
rule.

Packaging ships modules-load.d/punktfunk.conf + 60-punktfunk.rules under
the sysext's /usr/lib, but a systemd-sysext image MERGES after
systemd-modules-load and early udev have already run, so on a plain reboot
of a sysext host (e.g. Bazzite) those files are read too late: vhci_hcd is
never loaded, usbip fails, and the pad silently degrades to non-promoted
UHID — the controller vanishes from Game Mode. (deb/arch/rpm are
unaffected: real /usr is present at early boot.)

Fix: sysext post_merge now mirrors BOTH files into real /etc (read at the
normal early-boot time, shadowing the /usr copies by filename; refreshed
every merge since neither is user config), then reloads udev, modprobes
vhci-hcd, and re-triggers the vhci platform device for the live session.
Also raise the UHID-fallback log INFO->WARN with an actionable hint.

Verified on the .41 sysext host: after the /etc mirror, unloading vhci_hcd
and restarting systemd-modules-load (the real reader of /etc/modules-load.d)
reloads the module; a udev coldplug trigger makes attach/detach root:input
0660; the unprivileged host user can then write attach — the exact working
precondition for the usbip transport, now durable across reboot.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-13 17:41:51 +02:00
..