Problems with webcamd and RTL2832U
Hans Petter Selasky
hps at selasky.org
Wed Apr 27 08:55:54 UTC 2016
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-220.127.116.11. 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 >= 18.104.22.168; 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
> 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
> 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?
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.
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