a7d2718aa4a887025e5134d55882d0c5cc4b6d5c
It can happen that the main AlsaAudioBackend::_device_reservation is still busy while I/O devices are set. In this case a dedicated AlsaDeviceReservation needs to be used which can fail silently. A common example is disconnecting a USB device while it is in use. The Halted signal can show the session dialog, which calls set_input_device_name before the device reservation of the unplugged device terminated.
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