Messages in this thread | | | Date | Tue, 4 Nov 2008 10:23:46 -0500 (EST) | From | Alan Stern <> | Subject | Re: usb device not showing up |
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On Tue, 4 Nov 2008, Norbert Preining wrote:
> Hi Alan, > > On Mo, 03 Nov 2008, Alan Stern wrote: > > What happens if you leave the modem turned off until after Linux is > > running? If it does not show up then a usbmon trace would be helpful > > (see Documentation/usb/usbmon.txt for instructions). > > I can run usbmon, but I am not sure what you mean with "leave the modem > turned off until after Linux is running".
I must have misunderstood your earlier message, where you wrote:
> Interestingly this device does disappear if I cold boot into linux. > > So: > - First booting Vista, then RE-booting (not turning it off in the > meantime) into linux gives me that device and everything works.
By "it", did you mean the laptop or the modem?
> If I start from turned off state of the laptop and boot into linux the > device is not showing up. Is it that state you are interested in getting > the usbmon output?
No. I'm interested in seeing the usbmon output for when the modem is first detected by the USB subsystem. During a normal boot this will happen before you can start usbmon.
If you can't boot with the modem off, then try this instead: Unload ehci-hcd, uhci-hcd, and ohci-hcd, then start up usbmon (copy the 0u file) and reload whichever driver the modem attaches to.
Alan Stern
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