Messages in this thread | | | Date | Tue, 10 Aug 2010 13:34:59 -0700 | From | Greg KH <> | Subject | Re: USB device getting different product ids |
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On Tue, Aug 10, 2010 at 05:08:00PM +0200, Dhaval Giani wrote: > Heya, > > Admittedly I am using an older kernel, but I was wondering if a USB > device can get different product ids on being plugged in at different > times. I have one of these nice USB modems to connect to the internet > . It is one of these huawei devices. Now, most of the times, it gets > detected with vendor id 0x12d1 and product id 0x1446. In this mode, on > loading the usbserial module, I see only ttyUSB0 come up, which for > whatever reason, I am unable to use to connect to the internet. > However when it is detected as the product id 0x140b, I get > ttyUSB[0-2] which then connects very nicely via both wvdial and > networkmanager to the internet. Now obviously, I would like for the > device to get detected as 0x140b each time, as opposed to me pulling > it out and inserting it back in till does get detected as 0x140b :-). > > So my question is, > > 1. Is it possible for the same device to get different product ids at > different times
Yes, it's quite common for some devices to do this.
> 2. If so, how do I possibly get it to detect the id I want, as opposed > to playing a game of chance.
Look at the usb-modeswitch program, it's what you want to control this.
> (I would copy linux-usb if I knew the mailing list id, but as I am on > a slow GPRS connection, which is quite flaky right now, I would like > to send this out right now. Please copy that list if it would help!)
In the future, it's the linux-usb@vger.kernel.org list, also available in the MAINTAINERS file.
thanks,
greg k-h
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