Disable USB autosuspend for the CM6206 USB audio device

The CM6206 provides the digital outputs for sources 1-3; with kernel
USB autosuspend active it can power down between uses and glitch on
resume. Pin power/control to 'on' from the same udev rule that already
names the card.

Signed-off-by: Stamate Viorel <stamate.viorel@gmail.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: stamateviorel

CHANGELOG.md

@@ -6,6 +6,7 @@
   * Update our spotify provider `go-librespot` to `0.7.3`
   * Upgrade from Logitech Media Server 8.5.2 to Lyrion Music Server 9.0.3
   * Added in-place preamp recovery when I2C writes fail persistently
+  * Disabled USB autosuspend for the CM6206 USB audio device
 * Web App
   * Add warning for older versions of the webapp running on newer backends
 

config/85-amplipi-usb-audio.rules

@@ -1 +1,4 @@
 ACTION=="add", SUBSYSTEM=="sound", DEVPATH=="/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.3/1-1.3\:1.0/sound/card?", ATTR{id}="cmedia8chint"
+
+# Disable USB autosuspend for CM6206 audio codec to prevent mid-stream suspend hang
+ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0d8c", ATTR{power/control}="on"