Re: 2 identical cards, devicesnums sometimes exchanged OT?

[Nick <kno...@gm...>]

On 20/06/06, Andreas <An...@t-...> wrote:
> Hello List,
>
> i encountered a silly problem with lirc (or linux-dvb). Im using 2 aver
> dvb-t 771 cards inside
> my pc. Sometimes (after restart), the device-number is exchanged with the
> number from
> other card - this put me into a small problem, cause im using just one
> remote receiver of
> just one card. Is there any way to prevent that? Ive not any clue, why
> sometimes my
> receiver is on /dev/event2 and sometimes on /dev/event3.

Hi Andreas,

With 2 identical cards it is going to be harder to match one of the
cards, but I would suggest using a udev rule matching the PCI address
of the correct card you want to use. On my PVR system I have 3
identical DVB cards, and although I don't use their IR receiver, 3
/dev/input devices are created.

For example, using the command

# udevinfo -a -p $(udevinfo -q path -n /dev/input/event2})

tells me which PCI address the input/event2 device belongs to (you
might need to change this to match your device names). You could then
use the output from this command to construct a rule that always
matches the particular card, based on its PCI address (Which I do not
think changes as long as the card stays in the same PCI slot).

The udev rule HOWTO is a great place to learn how to construct rules
using SYSFS attributes:

http://www.reactivated.net/writing_udev_rules.html#sysfstree

Good luck,
Nick

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