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fix: route audio to a USB DAC connected at power-on on tg5040 #866

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fix: route audio to a USB DAC connected at power-on on tg5040 #866

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8 changes: 8 additions & 0 deletions skeleton/SYSTEM/tg5040/paks/MinUI.pak/launch.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,14 @@ sh "$SYSTEM_PATH/bin/governor.sh" "auto"
keymon.elf & # &> $SDCARD_PATH/keymon.txt &
batmon.elf & # &> $SDCARD_PATH/batmon.txt &

# a USB DAC present at power-on takes card 0 from the codec; a software replug restores codec 0, DAC 1
if grep -q '^ 0 \[.*\]: USB-Audio' /proc/asound/cards 2>/dev/null; then
usbdev=$(basename "$(dirname "$(readlink -f /sys/class/sound/card0/device)")")
echo "$usbdev" > /sys/bus/usb/drivers/usb/unbind
sleep 1
echo "$usbdev" > /sys/bus/usb/drivers/usb/bind
fi

# start fresh, will be populated on the next connect
rm -f $USERDATA_PATH/.asoundrc
audiomon.elf & # &> $SDCARD_PATH/audiomon.txt &
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