On Sat, Sep 08, 2012 at 02:06:19PM -0400, Florian Wöhrl wrote: > > Hello everybody, > > I am trying to get a USB IO Board running with Debian on Raspberry > PI and other 2.6.+ distributions (e.g. Ubuntu 12.04). > > The board used to run fine with kernel 2.4.+ (e.g. Ubuntu 10.04) - a > Device /dev/ttyACM0 was created and usable. > But with newer kernels no device is created and dmesg tells: > > # dmesg > [ 3.391258] usb 1-1.2: new full-speed USB device number 4 using dwc_otg > [ 8.531474] usb 1-1.2: unable to read config index 0 > descriptor/start: -32 > [ 8.531510] usb 1-1.2: chopping to 0 config(s) > [ 8.532305] usb 1-1.2: string descriptor 0 read error: -32 > [ 8.532341] usb 1-1.2: New USB device found, idVendor=04d8, > idProduct=000a > [ 8.532359] usb 1-1.2: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [ 8.532880] usb 1-1.2: no configuration chosen from 0 choices > [ 8.532896] usb 1-1.2: No support over 500mA You are sucking too much power for the device, try plugging a powered hub in and the device into that, and then all should be good. On much older kernels, we didn't keep track of the power accounting, and bad things happened at times. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
