[mythtv-users] Indoor HD antenna question

Ashu Desai ashu.desai at gmail.com
Fri Apr 13 17:17:34 UTC 2018

Seems that the driver doesn't seem to load - or that's what I am getting
when I look in the dmesg.

On Fri, Apr 13, 2018 at 11:14 AM Stephen Worthington <
stephen_agent at jsw.gen.nz> wrote:

> >> When you get messages like the ones you are getting such as "disagrees
> >> about version of symbol snd_ctl_add" and then "Unknown symbol
> >> snd_ctl_add", it normally means that your drivers are not compatible
> >> with your kernel version and need to be recompiled for the current
> >> kernel.  The symbol table for that symbol now says it has a different
> >> size or format in the kernel from what your driver file has in its
> >> symbol table.  Since the drivers for your card are supposed to be
> >> built into the kernel, that should not be happening.
> >>

How do I "recompile" or add the drivers again to make sure that isn't the

> >
> >Is this maybe because the antenna wasn't connected at the time? Or should
> >the driviers showing up regardless?
> No, the drivers should load without any aerial connected.
> But - the Avermedia AVerTVHD card is the one with the saa7134 chip, so
> the problem is with the drivers for that card.  Which is not the tuner
> you are trying to use in MythTV.  The ATSC tuner, Air2PC v2, does not
> use that driver, and should therefore not be affected by the problem
> with the saa7134 driver.  If the AVerTVHD tuner was working, I would
> expect that you would have two tuners showing up as /dev/dvb/adapter0
> and /dev/dvb/adapter1.
> Here's what I find:

ls /dev/dvb/adapter0/
demux0  dvr0  frontend0  net0

> I do have to wonder what on Earth someone in North America is doing
> with a DVB-T tuner that can not receive the TV in that part of the
> world.  Maybe it is the tuner that has a decent remote control?  The
> remote is not tied to the tuner - they are separate devices and the
> remote probably works even though the AVerTVHD tuner driver is not
> loading.  Although I would have thought that the PVR-150 tuner would
> have the best remote, if it was the model that came with one.  My
> PVR-500 (dual PVR-150) came with the excellent remote I am still using
> even though the PVR-500 itself is long retired.
> >>
> >> However, it is possible that those messages are referring to a
> >> different device, as you did not post enough of your logs to be able
> >> to tell.  It might be a good idea to post the entire section of the
> >> logs from start of bootup until the system is running.  Put it on
> >> pastebin.com and post a link.
> >>

here's the link to the dmesg


> >> Is it possible you have other DVB devices in that PC?  The name
> >> "Air2PC v2" does not match an AverMedia card.  That name appears to be
> >> for a TecniSat ATSC USB tuner for the US market:
> >>
> >> https://www.linuxtv.org/wiki/index.php/TechniSat_Air2PC-ATSC-USB
> >>
> >> What does this command show:
> >>
> >> ls -al /dev/dvb
> >>
> >
> >ls -al /dev/dvb
> >total 0
> >drwxr-xr-x  3 root root   60 Mar 29 04:37 .
> >drwxr-xr-x 23 root root 4140 Apr  9 20:01 ..
> >drwxr-xr-x  2 root root  120 Mar 29 04:37 adapter0
> >
> >
> >>
> >> So where are you - are you trying to receive DVB-T signals (eg UK,
> >> Europe, Australia, New Zealand) or are you trying to receive ATSC
> >> (USA)?
> >> ___________
> >
> >
> >I am in US - Chicago area.
> I am going to make a wild guess here, as to what your real problem is.
> I think that you have your aerial connected to the one of the PCI
> cards in your PC.  You have two that have aerial connectors, the
> PVR-500 and the AVerTVHD.  Neither of which is the correct tuner to
> have the aerial cable on.  The ATSC tuner, the only one that will now
> work for you, is a USB tuner.  So it will be on the end of a USB cable
> plugged into one of the PC's USB ports, which might even be on the
> front of the PC instead of the back.  It is also possible that it is
> draped somewhere inside the PC with its USB connected to a header on
> the motherboard internally.  So you need to find it and plug the
> aerial into it.

The antenna is connected to AverMedia card - i confirmed that.

I haven't used the TV side of myth in over 5 years - maybe more. So I am
not sure when I used the cards last. But when I did - I know i had my cable
plugged in and it used to work fine.

As it stands, currently, NOTHING is plugged in to the PVR-150 and my HD
indoor antenna plugged into the AverMedia card.

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