On Tue, 2013-11-05 at 21:16 +0000, Luke-Jr wrote: > I am trying to interface with the "HEX" devices sold by http://technobit.eu/ > which appear as CDC-ACM devices, but give an I/O error whenever I try to open > them, with some rather unclear error description in dmesg: > > [10526714.860052] usb 5-2: new full-speed USB device number 4 using uhci_hcd > [10526715.055017] usb 5-2: New USB device found, idVendor=04d8, idProduct=000a > [10526715.055026] usb 5-2: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [10526715.055032] usb 5-2: Product: CDC RS-232 Emulation Demo > [10526715.055037] usb 5-2: Manufacturer: Microchip Technology Inc. > [10526715.058200] cdc_acm 5-2:1.0: This device cannot do calls on its own. It > is not a modem. > [10526715.061222] cdc_acm 5-2:1.0: ttyACM0: USB ACM device > [10526756.939797] tty_port_close_start: tty->count = 1 port count = 0. > > The manufacturer reports that it works fine on Windows. > Any ideas how I can get this to work on Linux, or at least get more meaningful > error information so it can be debugged further? What does strace say? The kernel message is a warning, not a hard error. Regards Oliver -- 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
