Mailing List Archive: MythTV: Users

Questions about udev and /dev/video* ...

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stuart at xnet

Jan 20, 2008, 10:45 AM

Post #1 of 3 (1134 views)
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*Questions about udev and /dev/video ...**

Hi...

Know this is a mythtv and not a udev list, but was wondering if any had
and already solved this problem on their mythtv box?...

I have a PVR250 NTSC and KWorld 110 ATSC tuner in my mythtv box. The
PVR250 had a tendency to boot up with different /dev/video* names. So,
I used a udev rule to create a permanent device name and link it to the
/dev/video* device. The problem is that the created permanent device
name links to the wrong device. For instance, I will find /dev/pvr250
linked to /dev/video24 after boot up. This doesn't work. But if I
manually remove /dev/pvr250 and re-link it to /dev/video0, all is well.

So, does anyone know why this is happening?

...thanks
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kkuphal at gmail

Jan 20, 2008, 9:26 PM

Post #2 of 3 (1053 views)
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*Re: Questions about udev and /dev/video ...** [In reply to]

On Jan 20, 2008 12:45 PM, stuart <stuart [at] xnet> wrote:

>
> Hi...
>
> Know this is a mythtv and not a udev list, but was wondering if any had
> and already solved this problem on their mythtv box?...
>
> I have a PVR250 NTSC and KWorld 110 ATSC tuner in my mythtv box. The
> PVR250 had a tendency to boot up with different /dev/video* names. So,
> I used a udev rule to create a permanent device name and link it to the
> /dev/video* device. The problem is that the created permanent device
> name links to the wrong device. For instance, I will find /dev/pvr250
> linked to /dev/video24 after boot up. This doesn't work. But if I
> manually remove /dev/pvr250 and re-link it to /dev/video0, all is well.
>
> So, does anyone know why this is happening?

The ivtv driver should have a ivtv_first_minor option you can add to your
modprobe.conf and set it to 1. This will cause the PVR to always be on
/dev/video1 leaving /dev/video0 open for the ATSC card no matter what order
the drivers load in.

Kevin

stuart at xnet

Jan 21, 2008, 8:45 AM

Post #3 of 3 (1048 views)
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*Re: Questions about udev and /dev/video ...** [In reply to]

Kevin Kuphal wrote:
> On Jan 20, 2008 12:45 PM, stuart <stuart [at] xnet
> <mailto:stuart [at] xnet>> wrote:
>
>
> Hi...
>
> Know this is a mythtv and not a udev list, but was wondering if any had
> and already solved this problem on their mythtv box?...
>
> I have a PVR250 NTSC and KWorld 110 ATSC tuner in my mythtv box. The
> PVR250 had a tendency to boot up with different /dev/video* names. So,
> I used a udev rule to create a permanent device name and link it to the
> /dev/video* device. The problem is that the created permanent device
> name links to the wrong device. For instance, I will find /dev/pvr250
> linked to /dev/video24 after boot up. This doesn't work. But if I
> manually remove /dev/pvr250 and re-link it to /dev/video0, all is well.
>
> So, does anyone know why this is happening?
>
>
> The ivtv driver should have a ivtv_first_minor option you can add to
> your modprobe.conf and set it to 1. This will cause the PVR to always
> be on /dev/video1 leaving /dev/video0 open for the ATSC card no matter
> what order the drivers load in.
>
> Kevin
>
>
> --------

Thanks Kevin for your help. I'll give it a try.

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