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[Pieter <1527491@xxxxxxxxxxxxxxxxxx>]

2012 ubuntuforum, same device, worked and then stopped after a upgrade.
http://ubuntuforums.org/archive/index.php/t-1923883.html

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https://bugs.launchpad.net/bugs/1527491

Title:
  QinHeng Electronics HL-340 USB-Serial adapter

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  USB serial adapter detected but not working.

  $ lsusb
  Bus 001 Device 125: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter

  
  $ ls /dev/ttyU*
  /dev/ttyUSB0

  From syslog
  Dec 18 09:35:23 pieter-ThinkPad kernel: [487228.018937] usb 1-1: new full-speed USB device number 126 using xhci_hcd
  Dec 18 09:35:23 pieter-ThinkPad kernel: [487228.183954] usb 1-1: New USB device found, idVendor=1a86, idProduct=7523
  Dec 18 09:35:23 pieter-ThinkPad kernel: [487228.183959] usb 1-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
  Dec 18 09:35:23 pieter-ThinkPad kernel: [487228.183962] usb 1-1: Product: USB2.0-Ser!
  Dec 18 09:35:23 pieter-ThinkPad kernel: [487228.184731] ch341 1-1:1.0: ch341-uart converter detected
  Dec 18 09:35:23 pieter-ThinkPad kernel: [487228.185569] usb 1-1: ch341-uart converter now attached to ttyUSB0
  Dec 18 09:35:23 pieter-ThinkPad mtp-probe: checking bus 1, device 126: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-1"
  Dec 18 09:35:23 pieter-ThinkPad mtp-probe: bus: 1, device: 126 was not an MTP device

  
  $ uname -a
  Linux pieter-ThinkPad 4.3.0-040300-lowlatency #201511020949 SMP PREEMPT Mon Nov 2 14:55:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  
  Google search
  http://comments.gmane.org/gmane.linux.usb.general/121851
  https://bugzilla.redhat.com/show_bug.cgi?id=1235715
  http://unix.stackexchange.com/questions/189896/testing-if-hl-340-works

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