[mythtv-users] Mythtv .23 dev/ttyUSB0 stopped working

Gabe Rubin gaberubin at gmail.com
Wed Sep 8 16:02:17 UTC 2010


On Wed, Sep 8, 2010 at 4:50 AM, Randy Ferrill <randyf at cbcast.com> wrote:
>  I rebooted my Mythdora 12 box last night now the channel changer script
> stopped working. Any clues? After a couple minutes when I manually run the
> script I get an input/output error
>
> lsusb
> Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 003 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
> Port
> Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
> lsmod |grep usb
> usbserial              27029  1 pl2303
> dvb_usb_dib0700        44840  0
> dib7000p               13062  1 dvb_usb_dib0700
> dib7000m               11312  1 dvb_usb_dib0700
> dib0070                 6211  1 dvb_usb_dib0700
> dvb_usb                12304  1 dvb_usb_dib0700
> dib3000mc               9617  1 dvb_usb_dib0700
> dib8000                19871  1 dvb_usb_dib0700
> dvb_core               71956  3 dib7000p,dvb_usb,dib8000
> i2c_core               21774  20
> dvb_usb_dib0700,dib7000p,dib7000m,dib0070,dvb_usb,dib3000mc,dib8000,dibx000_common,lirc_i2c,tuner_simple,tuner,msp3400,saa7115,ivtv,i2c_algo_bit,v4l2_common,videodev,tveeprom,nvidia,i2c_piix4
>
>  dmesg | grep tty
> console [tty0] enabled
> serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> 00:0c: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> usb 3-2: pl2303 converter now attached to ttyUSB0
> pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
> usb 3-2: pl2303 converter now attached to ttyUSB0
> _______________________________________________


To be honest, I am surprised it was working for you.  I just put
together a new system without a serial port and purchased a
PCI->Serial adapter that uses the 2303X chipset and that did not work.
 I tried with a USB->Serial adapter and it had the same chipset.  I
wound up ordering a $5 serial header to bracket adapter from Newegg
and now all works fine.

The 2303X reports as pl2303.  It may be possible to get this working
(and it sounds like you had it working at some point), but I do not
have the skills and it was just easier to get the bracket.

Here is a thread discussing my issues with some links that might lead
you to the answer:
http://www.gossamer-threads.com/lists/mythtv/users/448508#448508


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