On Friday 23 November 2012 14:40:37 Jan Pohanka wrote:
> I have tried to reproduce this behavior directly on my PC, but there it
> works like a charm - at first I thought that the problem lies in cdc_acm
> driver, but today I tried to desolder the hub and connect the USB modem
> directly to the SoC. And voila it works too and I can use both ACM
> interfaces at time (one for ppp connection and second for maintenance and
> voice commands). But I definetely need a hub there...
>
> Could please someone give me some explanation how and why the 2414b USB
> HUB can do such problems and if there is any way how to fix it?
A trace with usbmon as described in Documentation/usb should show what IO
goes wrong.
Regards
Oliver
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