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I installed a fresh Ubuntu 13.10 64 bits in a new Asus I7 A55A. Standard install . All run perfect.
I connect a USB-Serial adapter model HL340, it has pl2303 chip but NEVER appear the /dev/ttysUSB0 device.

In other machines I found inmediatelly a new
    /dev/ttyUSB0
and all work perfectly.

I see in dmesg, signal that a device is connected
    usb 3-1: new full speed USB device using uhci_and address 3

But in the Asus i7 the device never appear.

I run

#  lsusb
Bus 008 Device 002: ID 0a5c:217f Broadcom Corp.
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 036: ID 2773:0104
..........
Bus 002 Device 036: ID 2773:0104

and see others devices (v 1.1, v2 and v3) BUT I don't see the device.

I read near 100 internet pages and Found this

# modprobe pl2303 vendor=0x4348 product=0x5523 --force

And I found it in
# lsusb
Bus 003 Device 003: ID 4348:5523 WinChipHead USB->RS 232 adapter with Prolifec PL 2303 chipset

But again, i never found the
    /dev/ttysUSB0

I have some dudes:
* the hardware is HL340, but the module should be usbserial? pl2303? both?
* i used the --force to load the module, but Iḿ not sure is the right module.
* In a 32 bits environment it works as /dev/ttysUSB0, may be the 64 bits is the problem?
* Its a very know hardware, but it doesn't work with 13.10 and 10-2013 ?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Ubuntu 13.10 pl2303 hl340 64 bits problem
https://bugs.launchpad.net/bugs/1243607
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