[mythtv-users] Which device is which
nick at rout.co.nz
Fri Feb 17 00:18:16 UTC 2006
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
There are also often debug options for some modules, which will spew
more info to dmesg, giving you some more to go on.
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Nick Rout <nick at rout.co.nz>
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