On 18/01/17, Greg KH wrote: > On Wed, Jan 18, 2017 at 05:05:34PM +0100, Oliver Graute wrote: > > Hello list, > > > > i'am using a GSM/UMTS Module on a PCB which is connected with USB 2.0 > > Hi-Speed to my imx6ul CPU. To reduce our Electromagnetic compatibility > > and to make my hardware colleges happy again I want to downgrade to USB > > Full Speed. > > > > How can I tell the Linux Kernel to Do so? > > You can't. It's up to the device to tell the host what "speed" it is > running at. See the USB spec for all of the crazy details. > ok thx for this important hint > I suggest you modify the firmware of your modem to do this, that's the > only way it is going to work (note, your device needs to be able to > support full speed, it might not be able to do that.) I know that the cinterion gsm module support full speed. I have to check their docs how to force the module into fullspeed. Best Regards, Oliver _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
