@unrud:
Thanks for the tests. Also tested on 16.04.1 live - interestingly, the devices
seem to be on /dev/i2c-9 there.
However, I think even SMBus isn't at fault. Digging through the logs I
noticed I forgot to check the dmesg logs - seems like sometimes the BIOS
touches the amp for some reason:
Also having the issue on a fresh 16.04.1. init-headphone 0.11 gets EBUSY
on the first write to SMBus (modified to print out errno, diff below).
Used to work on 15.04-15.10 on the same laptop.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 16.04.1 LTS
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