Im trying to remap a 4 channel hardware alsa pcm device to change the channel order.
Ive created a default.pa file in ~/.config/pulse which performs the remap and sets the new sink as the default sink.
Under Ubuntu 20.04 this all works fine if I stop the pulseaudio daemon as a user (under 20.04 by default the pulseaudio daemon is a user process) and restart it.
If I reboot this fails - the log has 3 messages, master sink not found, remap failed to initialize and sink does not exist - because it seems the master sink does not exist at the time the remap is being done (only the null sink exists I think).
The log shows that the sink I want as master is only created much later by a some black box process to me - which also appears to be creating a lot of other surround sinks.
I should note that before updating the default.pa file after I login and run pacmd list-sinks there is only 1 sink which is the surround-40 sink which is the original master sink I want to remap.
How can I delay the remap creation till this sink is created?
How are the raw Alsa hardware kernel pcm devices mapped into pulse?
Thanks
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