Summary: not a problem with the modem.

As you may recall, with my USB modem plugged in, plugging
in another device (eg: webcam) caused the modem to stop
responding to URBs (they come back with -EILSEQ = -84).  Well,
if I plug in my Phillips webcam, then plug in the modem, the
webcam has the same problem:

kernel: pwc pwc_isoc_handler() called with status -84 [CRC/Timeout].
kernel: pwc Frame buffer underflow (11258 bytes); discarded.
kernel: pwc Frame buffer underflow (23692 bytes); discarded.

The difference is that the webcam seems to recover after this.
Why doesn't the modem recover?  I don't know.

Duncan.


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