Dave Higton wrote:
On Thursday May 14, Ethan wrote:
I'm having trouble with a 7-port, powered USB hub made by D-Link
(model DUB-7). The devices plugged into the hub seem to work fine for
small transfers, but large transfers (such as to/from a scanner or
usb-storage device) break something. Once things are "broken" I see
from the syslog that the bus is reset every few seconds. It is not
clear to me if any data moves at all between bus resets but it is very
little if anything. When the bus is in this state, all devices on the
bus become inaccessible not just the one that was engaged in the
transfer. Removing and reinstalling the ehci_hcd and ohci_hcd modules
seems to reset the bus and correct the problem until the next large
transfer is initiated.
I suspect the problem lies with the hub because all of the devices
work fine when plugged directly into the computer or when plugged into
a different brand hub.
I also have a DUB-7 that I use on RISC OS. I noticed a long time ago
that most mass storage devices won't work through it, though they
work fine when connected directly to the computer. I would be
interested in any insight that this thread might give me.
Dave
I thik this hub has the philips ISP1521 chip in it.. It has only one
TT per port. I've notitced if you have all high speed devices, it
seems to work. If it stops working you have to unplug/plug it to reset it.
I think windows has the same issue:
http://www.techtalkz.com/microsoft-device-drivers/243707-usb-problem-when-using-philips-isp1521-based-hub.html
--
Karl
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