[mythtv-users] Which device is which

[Nick Rout]

On Thu, 16 Feb 2006 16:40:46 -0700
Brian Wood wrote:

> 
> On Feb 16, 2006, at 4:32 PM, Michael Haan wrote:
> 
> >
> > Yeah, no I mean that the difficulty in telling which modules were  
> > loaded in response to which hardware or, conversely,  which drivers  
> > each card is using.  In any case, I pulled the Fusion5 out leaving  
> > just the pvr 350 and the HD3000 (again, a config which was working  
> > before) and grabbed lsmod | sort - here is some of it:
> >
> > btcx_risc              38857  3 cx8800,cx8802,cx88xx
> > button                 41185  0
> > cx22702                40389  1 cx88_dvb
> > cx8800                 71373  0
> > cx8802                 47173  1 cx88_dvb
> > cx88_dvb               46429  0
> > cx88xx                103265  3 cx8800,cx88_dvb,cx8802
> > dm_mod                 99337  0
> > dv1394                 57273  0
> > dvb_core              129277  1 video_buf_dvb
> > dvb_pll                45509  4 cx88_dvb,or51132,nxt200x,cx22702
> >
> > I'm posting this because I thought someone said that cx8800 would  
> > block cx88_dvb, or is it that I can only use one set of functions -  
> > dvb, or ntsc - at a time (in which case it's ok that both are loaded)?
> 
> You may be referring to something I posted, I had read that you could  
> not load the ntsc and the dvb drivers at the same time. I read this  
> in the Gentoo HowTo setup MythTV, but I think that information pre- 
> dated the integration of the hd-3000 drivers into the kernel, and may  
> no longer be valid.
> 
> But I have also seen several references to removing the analog driver  
> and (re) installing the dvb one.
> 
> My system loads both, and I have not seen any problems that I can say  
> with certainty are related to that, but I would like a definitive  
> answer, is it OK to load both driver modules ??
> 
> I am having some problems with QAM, and if the analog cx88 module is  
> contributing to them I'd like to know it, otherwise I don't want to  
> waste time disabling something harmless.

something worth remembering is that modules can have options - and to
see what they are you can use modinfo, eg modinfo bttv shows that there
is an option video_nr which can be used to ensure bttv gets the same  X
in /dev/videoX each time. If you specify modprobe bttv video_nr=7 it
will be at /dev/video7

unfortunately ivtv does not appear to have that option, but it does have

parm:           ivtv_first_minor:Set minor assigned to first card

as the minor device number is closely related to the X in /dev/videoX
you should be able to set where the ivtv device appears. See
README.devices supplied with the ivtv driver.

These options should be sepcified in /etc/modules.conf. How they get
there is often distro dependent.

I don't have the module for hd3000 on my box so I cannot check the
options.

There are also often debug options for some modules, which will spew
more info to dmesg, giving you some more to go on.


> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

-- 
Nick Rout <nick at rout.co.nz>