[mythtv-users] Is there a tuner limit? (problem with >8 tuners)

Chris Wilkie - NetrinoUK chris at netrino.co.uk
Mon Aug 20 13:08:50 UTC 2007

Thanks for the quick response Bill.

I don't believe this issue is down to hardware, although I'm happy to be
proved wrong, as the USB side of things seems to be fine.  Linux
recognises the tuners, and is able to push firmware to them, showing
that communications are working.  In my mind, this rules out any
hardware issues.  I'm far more suspicious of V4L, or the driver itself
getting upset when there are more than 8 tuners.

Feel free to correct me on this - I'm no expert when it comes to


-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Bill Williamson
Sent: 20 August 2007 12:55
To: Discussion about mythtv
Subject: Re: [mythtv-users] Is there a tuner limit? (problem with >8

On 8/20/07, Chris Wilkie - NetrinoUK <chris at netrino.co.uk> wrote:
> I've been pointed here by the chaps on the MythDora forum, hoping to 
> gain some advice on getting a box working with 12 tuners (6 x Nova-T 
> 500 dual tuner PCI cards).  I am able to get the first four cards 
> working, giving 8 tuners, but the last two throw errors when trying to
load the driver.

My first guess would be some sort of PCI address assignment issue.
How many PCI slots does the board have, and which of those are sharing
irqs/etc with your motherboard components?

I know you have the "grunt" to handle that many cards, but I've never
seen a machine take 6 high-bandwidth PCI devices, no matter how
expensive the system was.

Your first troubleshooting could be to keep the adapters from
initializing and then insmod them one by one to see which ones cause
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