4-Port USB Hub
My ancient warrior, Thinkpad T20, has one USB connector. I bought a Targus 4-port USB hub as a USB port "expander". When I connect it to the laptop, the light on the hub glows, so power is getting to it. When I attach my Zire 31 PDA to sync with Korganizer (running Kubuntu 8.04), the only way the PDA will sync is if I first issue an
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lsusb Code:
tail -f /var/log/syslog Code:
lsusb Is there a udev rule or something that I need to set up to make the 4-port be automagically recognized? |
Did you try plugging in the hub's auxillary power? Sometimes the hub cannot be adequately powered with just the USB power, so there would be an auxillary power adapter.
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If the hub works after running lsusb, what could power possibly have to do w/ this problem?
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Some devices require that the USB connection be plugged into a primary USB or a powered hub. They comsume too much power for an unpowered hub.
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htnakirs & AuroraCA,
You both mention inadequate power, a h/w solution, for a problem that already has a manual s/w solution (running lsusb). OP asked for help in configuring his/her system: Quote:
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You can start by referring to the Hub Power section here:
Wikipedia USB Hub Quote:
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Thank you archtoad6. The USB hub does have an extra USB connector for power, but my laptop has only one USB port. I suspect that power is not an issue as the device connected to the USB hub is a PDA which is self powered. That and I left the PDA connected for a few hours when the battery was initially showing about half power. When I checked later (to see if the PDA was being recognized) the battery meter showed as full -- so power is flowing through the USB hub to the PDA's connector.
To reiterate, when I plug the PDA into the USB hub, my laptop only sees the PDA if I enter an "lsusb" command. When I plug the PDA directly into the laptop's USB port, the PDA is recognized almost instantly. Therefore, I believe that it is the USB port itself that is not being recognized until the "lsusb" command is issued. So perhaps a udev rule, or something that the hal daemon can use, is needed to properly activate the USB hub. If not, then it's O.K., I can just take a second or two for the "lsusb" command since I always have a konsole open. Thank you all very much!! |
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