The PinePhone's device-pine64-pinephone package carries an ALSA UCM config that overrides the one provided by upstream alsa-ucm-conf in Alpine's alsa-ucm-conf package. The goal is to drop these overrides completely, and !5462 makes some effort to reduce the diff between our overrides and upstream. One of the overrides that have been removed by that MR is a symlink - the device-pine64-pinephone package will no longer install this symlink and it will be provided by the Alpine alsa-ucm-conf package instead. However, due to a limitation of the Alpine package manager, just upgrading the device-pine64-pinephone package will delete the symlink and not restore it from the alsa-ucm-conf package, which will cause audio to break. Users will need to manually reinstall the Alpine alsa-ucm-conf package to restore working audio.
In other words:
Initially, with device-pine64-pinephone-3-r4 or earlier installed, the symlink
/usr/share/alsa/ucm2/conf.d/simple-card/PinePhone.confwill point to/usr/share/alsa/ucm2/PinePhone/PinePhone.conf.Install upgrades, which will install device-pine64-pinephone-4-r0 or later. The symlink will now be gone. The
/usr/share/alsa/ucm2/PinePhonedirectory will also be gone. In this state, audio will stop working.Reinstall the alsa-ucm-conf package by running
apk fix --reinstall alsa-ucm-conf. The symlink will now exist again, now pointing to/usr/share/alsa/ucm2/Allwinner/A64/PinePhone/PinePhone.conf.Log out and back in, or simply reboot, so that pipewire-pulse etc are restarted and pick up the new UCM config. Audio will now work again.