[RFT] Major snd_hda rewrite

[Jan Beich]

Alexander Motin <mav at FreeBSD.org> writes:

> I would like request for testing of my work on further HDA sound
> driver improvement.
[...]
>  - Codec pins and GPIO signals configuration was exported via set of
> writable sysctls. Another sysctl dev.hdaa.X.reconfig allows to trigger
> driver reconfiguration in run-time. The only requirement is that all
> pcm devices should be closed at the moment, as they will be destroyed
> and recreated. This should significantly simplify process of fixing
> CODEC configuration. It should be possible now even to write GUI to do
> it with few mouse clicks.

reconfig seems to not honor hw.snd.default_unit sysctl. After
reconfiguration the sysctl was reset to `0' (default). Is this expected?
Even if it is specified as a tunable in loader.conf?