[ +CC: linux-usb ] On Wed, Aug 26, 2015 at 09:39:36PM +0530, Ajay Garg wrote: > Hi all. > > I am attaching the RS232-TTL via a serial-USB converter on my machine. > > However, when I connect a putty-session with my embedded-device, I see > strange issues (garbage characters transmitted from embedded-device to > putty; nothing can be read from putty into embedded-device). > > It seems that there is some issue with the driver. Why do think it's a driver issue? > Lots of these lines are seen in dmesg :: > > > ######################################################################################## > [ 8657.022997] ch341-uart ttyUSB0: > usb_serial_generic_read_bulk_callback - nonzero urb status: -71 > ######################################################################################## > > > > Other informations :: > > ######################################################################################## > ajay@ajay-HP-15-Notebook-PC:~$ lsusb > Bus 001 Device 002: ID 8087:8001 Intel Corp. > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub > Bus 002 Device 003: ID 05c8:036e Cheng Uei Precision Industry Co., Ltd (Foxlink) > Bus 002 Device 002: ID 0bda:b001 Realtek Semiconductor Corp. > Bus 002 Device 011: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter > Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > ######################################################################################## > > > ######################################################################################## > ajay@ajay-HP-15-Notebook-PC:~$ lsmod | grep ch341 > ch341 13761 1 > usbserial 38972 3 ch341 > ######################################################################################## > > > ######################################################################################## > ajay@ajay-HP-15-Notebook-PC:~$ uname -a > Linux ajay-HP-15-Notebook-PC 3.16.0-30-generic #40~14.04.1-Ubuntu SMP > Thu Jan 15 17:45:15 UTC 2015 i686 i686 i686 GNU/Linux > ######################################################################################## > > > > Any chance this can be made to work? Any upgrade that might solve the issue? > We will be grateful for ideas. This is a known issue with your device that has been reported in this thread: https://lkml.kernel.org/r/CAF3ayyDe44POd1NoSBqn_gjA8XLoK3r_getDYnWx+a_1rL0r5g@xxxxxxxxxxxxxx Looks like a hardware issue, I'm afraid. Johan -- 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
