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Dobry den panove a damy, po dlouhe dobe jsem potreboval pouzit redukci USB -> RS232 pro nastaveni displeje. Bohuzel po spusteni terminalu screen /dev/ttyUSB0 115200 nebo minicom mi jde chvili vkladat znaky a pak to zdechne a nejde vubec nic vkladat. Po ukonceni terminalu a opetovnem spusteni se situace nezmeni a terminal je mrtvi. Odpojeni a opetovnym pripojenim redukce k PC to zase chvili jde. Pak to zase zdechne. Myslel jsem, ze mi odesla redukce a poridil novou (jo jsem debil - kdybych testnul v jinem pc). Takze jak uz jsem zminil, kdyz nesla ani nova tak jsem to soupl do druheho PC s Windows 10 a obe jdou. Usb port funguje - kdyz do nej strcim cokoliv jineho, vsechno jede. I pres to jsem zkousel jine porty, ale vysledek stejny. V syslogu ani dmesg nic neni teda nic zavadneho jsem nenasel. Pouzivam Ubuntu 16.04 LTS a rekudkce od fa. Aten cip pl2303 lsusb

Bus 001 Device 004: ID 0557:2008 ATEN International Co., Ltd UC-232A Serial Port [pl2303]
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0557 ATEN International Co., Ltd
  idProduct          0x2008 UC-232A Serial Port [pl2303]
  bcdDevice            3.00
  iManufacturer           1 
  iProduct                2 
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x000a  1x 10 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0

lsmod

pl2303                 20480  1
usbserial              45056  3 pl2303

dmesg

[    6.003839] usbcore: registered new interface driver pl2303
[    6.003844] usbserial: USB Serial support registered for pl2303
[    6.003854] pl2303 1-4.3:1.0: pl2303 converter detected
[    6.004724] usb 1-4.3: pl2303 converter now attached to ttyUSB0