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-   -   turn usb power on off (http://www.linuxquestions.org/questions/linux-hardware-18/turn-usb-power-on-off-649391/)

knobby67 06-15-2008 06:52 AM

turn usb power on off
 
Hello all,
I'm having trouble with a USB device, basically the only way I can get it to work is to unplug then replug the device. I've tried everything else rm mod the insmod kernel modules, setting udev rules, trying every possible combination of xorg.
So my only conclusion is the device firmware somehow doesn't sync untill x has fully booted. xorg log sort of backs this up by showing a driver error for the device if plugged in from boot, if I plug unplug there's no error.

So my only way out seems to be to turn power on off to the device to reset firmware. Is there any command that can do this. I'm using Debian Etch.
Thanks.

bigrigdriver 06-15-2008 07:26 AM

It might help if you gave us a hint of what kind of USB device is giving you trouble.

Brian1 06-15-2008 08:05 AM

No way to power off the USB port that I know of. It would be more hardware and module specific to do so.

Brian

knobby67 06-15-2008 10:11 AM

Quote:

Originally Posted by bigrigdriver (Post 3185214)
It might help if you gave us a hint of what kind of USB device is giving you trouble.

It's a microtouch touch screen, didn't say product as I didn't think it was relervant to turning a port off.

I should add /dev/bus....devices shows it, but dmesg doesn't until I unplug and plug in again. The it's show and works.


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