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--- doc:appunti:hardware:qnap_ts-120 [2022/02/12 08:06] – [The Serial Console] niccolo
+++ doc:appunti:hardware:qnap_ts-120 [2025/01/10 11:15] (current) – [USB audio dongle] niccolo
@@ Line 252: / Line 252: @@
 Now try to reboot. If the problem is fixed, you may remove the file **/etc/initramfs-tools/conf.d/root** and run **update-initramfs** again: now the proper rootfs will be autodetected.
+===== USB audio dongle =====
+I use the QNAP also as a **media player** because it stores all my audio files. I attached it to my HiFi amplifier through an **USB audio dongle** and an **audio cable** (3.5 mm jack - RCA stereo plugs).
+I faced a problem with that audio USB interface, because at every reboot the device is not working and it does not show in **lsusb** output. The manual workaround was to unplup and re-plug the device into the USB port.
+Fortunately it is possibile to force the re-initialization of the USB controller with the following script:
+<code bash>
+#!/bin/sh
+# If the USB audio device is missing, try to reset the USB controller.
+# USB 2.0 devices may be under /sys/bus/pci/drivers/ehci_hcd instead.
+PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+lsusb | grep -q 'JMTek, LLC. audio controller'
+RET=$?
+if [ "$RET" -ne "0" ]; then
+    echo "USB audio device missing, trying to reset the bus."
+    cd /sys/bus/pci/drivers/xhci_hcd
+    echo -n "0000:02:00.0" > unbind
+    sleep 1
+    echo -n "0000:02:00.0" > bind
+fi
+</code>
+So I created a systemd service to be run when the host reaches the multi-user target. Create the file **/etc/systemd/system/usb-audio-dongle-reset.service**:
+<file>
+# /etc/systemd/system/usb-audio-dongle-reset.service
+#
+# Service executed once the system has reached the multi-user status.
+#
+#  Type=oneshot         The unit is up after the main process exits.
+#  RemainAfterExit=yes  The service shall be considered active even
+#                       when all its processes exited.
+#
+# Eanble the service with:
+#   systemctl enable my-startup.service
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/local/sbin/usb-audio-dongle-reset
+[Install]
+WantedBy=multi-user.target
+</file>
+Enable and start the service with:
+<code>
+systemctl --now enable usb-audio-dongle-reset.service
+</code>