Problems with webcamd and RTL2832U

[Hans Petter Selasky]

On 04/27/16 10:01, Greg 'groggy' Lehey wrote:
> I'm trying to set up MythTV on a 10.2-STABLE system using an RTL2832U
> class tuner and webcamd webcamd-4.2.0.9.  The tuner probes as:
>
>    Apr 27 12:36:40 tiwi devd: Executing 'logger Unknown USB device: vendor 0x0bda product 0x2838 bus uhub0'
>    Apr 27 12:36:40 tiwi root: Unknown USB device: vendor 0x0bda product 0x2838 bus uhub0
>
> These IDs are mentioned in https://wiki.freebsd.org/WebcamCompat,
> along with the comment:
>
>     Needs webcamd >= 3.10.0.7; seems to be only a bit less sensitive
>     than my dib0700 tuners (worse reception in low-signal areas);
>     remotes not supported yet by the Linux rtl28xxu driver and thus by
>     webcamd; also supported by the comms/dabstick-radio and
>     comms/rtl-sdr ports
>
> I run webcamd with the invocation:
>
>    webcamd -N RTL2838UHIDIR-Realtek -S 00000001 -M 0 -v 0 -B
>
> This creates the devices:
>
>    # ls -lR /dev/dvb/
>    total 1
>    dr-xr-xr-x  2 root  wheel  512 27 Apr 17:54 adapter0
>
>    /dev/dvb/adapter0:
>    total 0
>    crw-rw----  1 webcamd  webcamd  0x95 27 Apr 17:54 demux0
>    crw-rw----  1 webcamd  webcamd  0x96 27 Apr 17:54 dvr0
>    crw-rw----  1 webcamd  webcamd  0x97 27 Apr 17:54 frontend0
>
> When I run mythtv-setup and try to access the tuner, I get the
> messages:
>
>    2016-04-27 17:27:43.168109 W  DiSEqCDevTree: No device tree for cardid 1
>    2016-04-27 17:27:57.021513 W  DiSEqCDevTree: No device tree for cardid 1
>
> ktrace tells me:
>
>    3391 mythtv-setup CALL  openat(AT_FDCWD,0x8608eb598,0x2<O_RDWR>,<unused>0)
>    3391 mythtv-setup NAMI  "/dev/dvb/adapter0/frontend0"
>    3391 mythtv-setup RET   _umtx_op -1 errno 60 Operation timed out
>    ...
>    3391 mythtv-setup CALL  write(0x1,0x7fffdfbfb640,0x49)
>    3391 mythtv-setup GIO   fd 1 wrote 73 bytes
>         "2016-04-27 17:04:39.188786 W  DiSEqCDevTree: No device tree for cardid 1
>         "
>    3391 mythtv-setup RET   write 73/0x49
>
> There's nothing of importance between the attempt to open
> /dev/dvb/adapter0/frontend0 and the error message, so clearly that's
> the reason for the message, even if it's not quite appropriate.
>
> I don't see any mention of rtl28xxu in current documentation, and no
> way to specify a driver in the man page.  Can I assume that this is an
> undocumented change?  Any ideas how to corner the problem?
>

Hi,

1) Check that you have only one instance of webcamd running.
2) Test device with w_scan utility (from ports) first.
3) MythTV: ensure you configure correctly DVB-T / S / S2 and so on.

--HPS