Hi Terry,
> Not in fact the problem, see :
>
> http://forum.modmypi.com/technical-support/usb-audio-adaptors-pi-locking-up-when-booting-t1041.html#p4482
>
> It turns out that the problem seems to be that the Hub is connected
> via a USB port on the Pi (the only one in the case of the Zero). It
> looks like that port cannot handle the conflicts when all the Audio
> Adaptors shout at once.
I don't see a strong indication that's the cause? What conflicts?
> If I plug all the Adaptors directly into a Pi 2 or Pi 3 (even when I
> am using a hub for the other devices (mouse, keyboard, WiFI)),
> everything works.
The different Pis have different USB hardware, and different Linux
drivers to talk to them IIRC. And those drivers change over time. Try
a distro with a dramatically different kernel version, like an old one.
It will be another data point.
Also, I think `journalctl -f' might be interesting to watch as you do
things. You can tap Enter to give you a bit of blank space now and
again so you can see what's new. You can try doing this over an SSH
connection to the Pi for when you run `startx', but given networking is
also over the Pi's USB port I'd really recommend you use the Pi's serial
port and set the Linux console to use that. Cables are available.
http://elinux.org/RPi_Serial_Connection
http://amzn.to/2iAd006
Other thoughts: startx(1) will prod USB as well as creating CPU load
causing the ARM to draw more power as its frequency increases. Try and
create a CPU load some other way; this should make one core busy and
you can run it in the background so you can kick off one per core if
need be.
gzip -9 </dev/urandom >/dev/null
Check `dmesg' output. `dmesg -w' will wait for new output, similar to
journalctl above.
Replace the audio USB adapters with other devices that will want
significant current to see if it helps spot when it's the £3 Chinese
audio USBs or a power issue.
Cheers, Ralph.
--
Next meeting: Bournemouth, Tuesday, 2017-02-07 20:00
Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/
New thread: mailto:[email protected] / CHECK IF YOU'RE REPLYING
Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR
