librem5-base-defaults: Use librem5.state file to store ALSA state

This prevents the old asound.state file to be loaded with outdated
values that are potentially incompatible with the new UCM.

As an added bonus, allow the state to be reset when the user deletes
the librem5.state file manually and reboots - previously
alsa-restore.service would simply regenerate the state file on
shutdown, making it hard to intentionally reset the state.

debian/librem5-base-defaults.install

@@ -6,7 +6,7 @@ default/adwaita-phone.jpg          usr/share/librem5/default-theme/
 default/audio/pulse                  etc/
 default/audio/profile-sets           usr/share/pulseaudio/alsa-mixer/
 default/audio/ucm2                   usr/share/alsa/
-
+default/audio/alsa-restore.service.d lib/systemd/system/
 
 default/sm.puri.OSK0.desktop         usr/share/applications/
 default/osk-wayland                  usr/bin/

default/audio/alsa-restore.service.d/librem5.conf

+[Service]
+# Make sure to not load outdated asound.state file and use librem5.state to store current state instead.
+# As an added bonus, allow the state to be reset when the user deletes the librem5.state file manually and reboots.
+ExecStartPre=/bin/rm -f /var/lib/alsa/asound.state
+ExecStart=
+ExecStart=-/usr/sbin/alsactl -E HOME=/run/alsa -E XDG_RUNTIME_DIR=/run/alsa/runtime -f /var/lib/alsa/librem5.state restore
+ExecStartPost=/usr/bin/touch /var/lib/alsa/librem5.state
+ExecStop=
+ExecStop=/bin/rm -f /var/lib/alsa/asound.state
+ExecStop=/bin/sh -c '[ -f /var/lib/alsa/librem5.state ]'
+ExecStop=-/usr/sbin/alsactl -E HOME=/run/alsa -E XDG_RUNTIME_DIR=/run/alsa/runtime -f /var/lib/alsa/librem5.state store