Hi,
My previous request for a loan of a powered Hub took me a step closer to
resolving my
problem (thanks David). The problem is that although I think I know now what
is causing
the problem, I don't know what it is doing to the machine.
So when I plugged David's Hub in, instead of the 'Naked' Hub, I got exactly the
same
symptoms as I got with my own Hub. So, the 'Naked' Hub isn't the cause and
neither is
the supplied PSU Brick.
After lots of testing, using different combinations of devices plugged into the
Hub, I have
arrived at the conclusion that the Audio Adaptors are the problem:
1. I have got an Edimax WiFi dongle, a mouse, a keyboard and three Audio
Adaptor
dongles plugged into a hub. Nine times out of 10, if I boot into a shell in
Raspbian Pixel,
the system is OK and I can see all three Audio Adaptors using lsusb or aplay -l.
2. On the tenth occasion, I get no response from the keyboard.
3. If I successfully boot into the shell and then type startx, the mouse
invariably freezes.
4. If I only plug one adaptor into the hub, I can usually get into Pixel, but
it occasionally
freezes.
I've looked in /var/log, but I'm uncertain what I'm looking for. The file
'messages' seems
to contain a conglomeration of messages from the kernel and elsewhere, but I
can't see
anything that leaps out of the screen at me.
Does anyone know where I should be looking?
--
Terry Coles
--
Next meeting: Bournemouth, Tuesday, 2017-01-03 20:00
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