[mythtv-users] Joy and pain (Daryl McDonald)

[NickS]

I'm also running Mythbuntu (12.04) with a USB infrared receiver, and had the same problem. The following steps are how I've resolve it:

*** 1. Identify the /dev/lirc mappings created at boot-time:

~$ ls /dev/lirc*
/dev/lirc0  /dev/lirc1  /dev/lirc2  /dev/lircd

~$ dmesg | grep lirc
[    7.675423] lirc_dev: IR Remote Control driver registered, major 250 
[    7.725757] rc rc0: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor = 0
[    7.937544] rc rc1: lirc_dev: driver ir-lirc-codec (saa716x) registered at minor = 1
[   11.655015] rc rc2: lirc_dev: driver ir-lirc-codec (cx23885) registered at minor = 2

In this case my mceusb device is number 0, i.e. /dev/lirc0 .

*** 2. Get more info on /dev/lirc0 :

~$ udevadm info -a -p $(udevadm info -q path -n /dev/lirc0)

  looking at device '/devices/pci0000:00/0000:00:12.0/usb4/4-3/4-3:1.0/rc/rc0/lirc0':
    KERNEL=="lirc0"
  ....
  looking at parent device '/devices/pci0000:00/0000:00:12.0/usb4/4-3/4-3:1.0/rc/rc0':
  ....
  looking at parent device '/devices/pci0000:00/0000:00:12.0/usb4/4-3/4-3:1.0':
  ....
  looking at parent device '/devices/pci0000:00/0000:00:12.0/usb4/4-3':
    ATTRS{idVendor}=="1784"
    ATTRS{idProduct}=="0011"
  ....

*** 3. Create (or append to) the file /etc/udev/rules.d/z21-persistent-local.rules
the following udev rule:

KERNEL=="lirc*", ATTRS{idVendor}=="1784", ATTRS{idProduct}=="0011", SYMLINK+="input/irremote"

Note how the specified elements match the output from step #2 above.

*** 4. Reload the udev rules and test the new rule to make sure it works:

~$ sudo udevadm control --reload-rules
~$ sudo udevadm test -a -p  $(udevadm info -q path -n /dev/lirc0)

You should see lines confirming that your rules file has been read, the rule has been applied and the link has been created:

....
parse_file: reading '/etc/udev/rules.d/z21-persistent-local.rules' as rules file
....
udev_rules_apply_to_event: LINK 'input/irremote' /etc/udev/rules.d/z21-persistent-local.rules:1
....
link_update: creating link '/dev/input/irremote' to '/dev/lirc0'
...
DEVLINKS=/dev/input/irremote
DEVNAME=/dev/lirc0
DEVPATH=/devices/pci0000:00/0000:00:12.0/usb4/4-3/4-3:1.0/rc/rc0/lirc0

*** 5. Of course step 4 was just a test, so restart udev and check that you can see the device link itself:

~$ sudo /init.d/udev restart
~$ ls -l /dev/input/irremote
lrwxrwxrwx 1 root root 8 Feb 13 00:19 /dev/input/irremote -> ../lirc0

*** 6. Update /etc/lirc/hardware.conf to specify the device:

REMOTE_DEVICE="/dev/input/irremote"

*** 7. Restart lirc:

~$ sudo /etc/init.d/lirc restart

And your remote should be working in the MythTV frontend :)
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