On Sat, Dec 13, 2014 at 01:15:07PM +0800, Liangent wrote: > Hello, > > I bought a new USB-RS232 cable and the system loads ch341.ko for me > (Debian with kernel 3.14-2-amd64 and 3.16.0-4-amd64). However this > module does not work with my cable (/dev/ttyUSB0 appears but the > serial device doesn't work properly) while the driver provided by chip > vendor[1] works (this driver doesn't compile on kernel 3.16 anymore > but 3.14 is fine). > > This is dmesg output with the vendor-provided driver. > > [ 1900.070021] usb 2-1.4: new full-speed USB device number 5 using ehci-pci > [ 1900.163218] usb 2-1.4: New USB device found, idVendor=1a86, idProduct=7523 > [ 1900.163227] usb 2-1.4: New USB device strings: Mfr=0, Product=2, > SerialNumber=0 > [ 1900.163232] usb 2-1.4: Product: USB2.0-Ser! > [ 1900.163887] ch34x 2-1.4:1.0: ch34x converter detected > [ 1900.165052] usb 2-1.4: ch34x converter now attached to ttyUSB0 > > For the record I've used an old cable which works fine with the > built-in ch341.ko driver, but unfortunately that cable is not in my > hand anymore. > > [1] http://wch.cn/downloads.php?name=pro&proid=177 That device should "just work" with the in-kernel driver. The fact that it is autoloaded is a good sign something is right. So no data flows through the device at all when using it, or are there other symptoms of "not working"? thanks, 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
