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fix: route audio to a USB DAC connected at power-on on tg5040 - #866
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A USB DAC that is already plugged in when the device boots registers before the internal audiocodec and takes ALSA card 0, pushing the codec to card 1. audiomon still writes .asoundrc for the DAC, but playback goes to the speaker until the DAC is unplugged and plugged back in, which leaves the codec on card 0 and the DAC on card 1. At boot, if card 0 is a USB audio device, unbind and rebind that USB device before audiomon starts, giving the same card order as a hotplug.
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Fixes #865
What
In the tg5040
MinUI.pak/launch.sh, beforeaudiomonstarts: if ALSA card 0 is a USB audio device, unbind and rebind that USB device.Why
A USB DAC that is already connected at power-on registers before the internal codec and takes card 0, pushing
audiocodecto card 1.audiomonfinds the DAC and writes.asoundrcfor card 0, but playback still goes to the speaker. After a physical replug the codec is card 0 and the DAC card 1, the layout the rest of the audio path expects (seeAUDIO_SINK_USBDAC's "assumes being exposed as card 1"), and audio reaches the DAC.Rebinding the device in software gives the same card order as a replug. The USB device is found from
/sys/class/sound/card0/device, so it doesn't depend on which port or DAC is used. Nothing happens when no USB audio device holds card 0, and the extra 1 s delay only applies in that case.Testing
On a TrimUI Brick (NextUI 6.15.0 with this
launch.sh), DAC: TTGK KM-HIFI-384KHZ:Not tested on the Smart Pro, which uses the same script. tg5050 isn't changed.
AI disclosure
This change was written with the help of an AI coding assistant (GitHub Copilot). I directed the work, reviewed the changes, and tested them on my own TrimUI Brick as described above.