[mythtv-users] One PCI DVB-T card, 2 items in lspci

Mike Perkins mikep at randomtraveller.org.uk
Fri May 29 07:47:29 UTC 2015


On 28/05/15 22:41, Hika van den Hoven wrote:
> Hoi Phill,
>
> Thursday, May 28, 2015, 11:29:36 PM, you wrote:
>
>>>> I have a DVB-T card which I've installed on a Proxmox server (a
>> hypervisor
>>>> similar to vmWare ESXi, XenServer etc). I'm trying to get PCI
>> passthrough
>>>> working on a MythBuntu VM and I'm part way there. One thing I'm confused
>>>> about is that the PCI card shows up with two entries when you run lspci:
>>>
>>>> 05:02.0 Multimedia video controller: Conexant Systems, Inc.
>> CX23880/1/2/3
>>>> PCI Video and Audio Decoder (rev 05)
>>>> 05:02.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI
>>>> Video and Audio Decoder [MPEG Port] (rev 05)
>>>
>>>> Why is that? I'[m asking because I can only get one of them to pass
>> through
>>>> to the MythBuntu VM (the one with ID 05:02.2).
>>>
>>> Probably because it's a dual tuner card. They normally show up as sub
>>> devices. (05:02.0 and 05:02.2) Just like hdmi audio on a video card
>>> shows up separately.
>
>> Hi, thanks for the suggestion, but I don't believe it is a dual tuner card.
>> And if it was, why would the descriptions be different? I feel there's some
>> other reason.
>
> It anyhow suggests two drivers are needed. You should look in the
> driver/kernel documentation on the name or the combination
> vendor/device id.
>
The second device also says [MPEG Port]. Wild-assed guess is that .0 carries the 
whole Transport Stream while .2 would give you a tuned mpeg stream of one 
subchannel.

-- 

Mike Perkins



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