Get sound, the screen and emoji working on musicdolphin's Pi 5

- HiFiBerry: the plain hifiberry-dacplus overlay makes the Pi the I2S clock consumer,
  which the Pi 5's controller refuses (snd_soc_dai_set_fmt -22). The card never probed,
  so every softvol_* device was dead: squeezelite crash-looped and the backend and
  shairport played into nothing. hifiberry-dacplus-std has the Pi drive the clocks.
  pi_hifiberry_amp now matches any dtoverlay=hifiberry-* line, so changing the overlay
  replaces the old one instead of adding a second.
- X: with two DRM devices (v3d, vc4) Xorg gave up with "Cannot run in framebuffer
  mode", and the kiosk looped on a blank screen. 99-vc4.conf points it at vc4, the
  display controller; rendering still goes to V3D (glxinfo: V3D 7.1, accelerated).
- The front-end's icons are emoji in the markup. The Lite image has no emoji font, so
  they rendered as empty boxes: install fonts-noto-color-emoji.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

host_vars/musicdolphin.yml

@@ -4,7 +4,10 @@ pi_shairport_name: _Oben_Wohnzimmer
 alsa_card_name: sndrpihifiberry
 sensor_room_name_ascii: wohnzimmeroben
 sensor_room_name: WohnzimmerOben
-hifiberry_overlay: hifiberry-dacplus
+# -std: the Pi drives the I2S clocks. The plain dacplus overlay makes the Pi the clock
+# consumer, which the Pi 5's I2S controller rejects (snd_soc_dai_set_fmt -22), so the
+# card never probes and every softvol_* device is dead.
+hifiberry_overlay: hifiberry-dacplus-std
 main_user: root
 
 mediapi_has_hifiberry_amp: true

roles/pi_hifiberry_amp/tasks/main.yml

@@ -8,7 +8,9 @@
 - name: Activate Hifiberry
   ansible.builtin.lineinfile:
     path: /boot/firmware/config.txt
-    regexp: "^#?dtoverlay=hifiberry-amp"
+    # Any hifiberry overlay, not just the one this used to set: otherwise changing
+    # hifiberry_overlay appends a second dtoverlay line and leaves the old one active.
+    regexp: "^#?dtoverlay=hifiberry-"
     line: "dtoverlay={{ hifiberry_overlay }}"
   notify: Reboot after HiFiBerry boot config change
 - name: Lift the Pi 5's USB current cap when the HiFiBerry board powers it

roles/pi_kiosk/tasks/main.yml

@@ -10,7 +10,37 @@
       # size in the corner of the screen. Openbox answers it, and nothing else.
       - openbox
       - unclutter
+      # The MusicMouse front-end's icons are emoji characters in the markup, not an icon
+      # font. Lite images ship no emoji font at all, so without this every icon renders
+      # as an empty box.
+      - fonts-noto-color-emoji
     cache_valid_time: 7200
+  notify: Reload systemd and restart getty
+
+- name: Ensure the Xorg config directory exists
+  ansible.builtin.file:
+    path: /etc/X11/xorg.conf.d
+    state: directory
+    mode: "0755"
+
+- name: Point X at the display controller
+  # The Pi 4 and 5 have two DRM devices: v3d (the 3D GPU, no outputs) and vc4 (the
+  # HDMI display controller). Left to itself Xorg cannot tell which to drive and dies
+  # with "Cannot run in framebuffer mode. Please specify busIDs for all framebuffer
+  # devices", so the kiosk loops on a blank screen. Display goes through vc4; rendering
+  # still lands on v3d, because glamor's GL context is routed there by Mesa (kmsro).
+  # Raspberry Pi's desktop image ships this same file; the Lite image does not.
+  ansible.builtin.copy:
+    dest: /etc/X11/xorg.conf.d/99-vc4.conf
+    content: |
+      Section "OutputClass"
+        Identifier "vc4"
+        MatchDriver "vc4"
+        Driver "modesetting"
+        Option "PrimaryGPU" "true"
+      EndSection
+    mode: "0644"
+  notify: Reload systemd and restart getty
 
 - name: Browser
   # Chromium comes from archive.raspberrypi.com, not Debian: that build carries the