USB question

[Robert Heller]

At Sat, 15 Sep 2018 12:48:57 +0100 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> I play music stored on my PC via a USB connection to my DAC.
> 
> The player (HQPlayer) does not detect the DAC after a reboot unless I
> physically remove the USB cable and re-insert it.
> 
> This suggested to me that some module was not automatically loaded at
> boot, so I did lsmod before and after re-inserting the cable to see if
> there was a new module in the list after re-insertion. However the two
> outputs listed the same modules, though they weren't quite identical -
> there were differences in the 'Used by' numbers following the Size (the
> significance of which I don't understand).

It likely a udev rule issue and/or systemd startup order thing.

> 
> Is there some other way I can track down what I need to do to ensure
> the DAC is recognised without having to keep un-plugging and
> re-plugging the USB cable?

I am not sure if this is going to be possible.

> 
> Ubuntu 18.04.1
> 
> - Richard.

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