On Wednesday, 4 January 2017 15:30:01 GMT Ralph Corderoy wrote:
> > > Have you this page, and in particular the anchored section?
> > > http://elinux.org/RPi_Powered_USB_Hubs#USB_Hub_Power_Hookup
> >
> > The answer is yes; that's exactly what I am doing.
>
> So you saw "This section describes two tests that will verify that a USB
> hub has the correct power circuitry"?
Yes. Although I didn't run them because the problem occurs with more than one
hub type, including David's with 3 A shared by all ports, and because I have
now discovered that the problem is the single port that carries all of the USB
traffic; see my other post.
> As mentioned last night, a USB device requests a current allowance.
> `sudo lsusb -v' will show lots of interesting information that's really
> worth reading through; ignore what doesn't make any sense. The sudo is
> required.
I added a line to config.txt; 'max_usb_current=1, which doubles the current
available to each device (in this case the whole hub) to 1.2 A. This was
advised by Jake on the ModMyPi forum, but it didn't help.
--
Terry Coles
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