Provided by: lirc_0.10.1-5.2_amd64 bug


       mode2 - Show kernel output available for LIRC drivers


       mode2 --driver <driver> [--device <device>] [other options]

       mode2 --raw --device <device> [other options]

       mode2 --driver <driver>  --list-devices


       The  original  purpose  of  this  program  has  been  to check operation of home-brew LIRC
       receiver hardware and to see the IR waveform of the remote controller without an expensive
       oscilloscope.  Over time, mode2 has evolved to a generic tool to check what kind of output
       the kernel makes available for lirc.

       mode2 will simply  print  pulse  and  space  lengths  to  stdout  for  drivers  supporting
       LIRC_MODE_MODE2.  For drivers supporting LIRC_MODE_LIRCCODE such as TV-cards and the irman
       driver writes the decoded, integer values.

       From version 0.9.4, mode2 can also list the devices available for  a  given  driver.  This
       requires enumeration support which is available in most but not all drivers.

       When given the correct driver mode2 should always work. Without a driver, the --raw option
       should always work for /dev/lirc* devices. At the time of writing, usb devices also  works
       in  most  cases.  However, since it is tricky to get the path to the usb device, such ones
       are normally best accessed using a driver.

       Not all drivers requires a device.


       -d --device=device
              Read from given device.

       -H --driver=driver
              Use given driver.

       -m --mode
              Write pulse/space data as raw config files. Does not affect LIRCCODE drivers.

       -s --scope=time
              Enable 'scope like display with time us per char. Does not affect lirccode drivers.

       -k --keep-root
              Don't drop root privileges after opening device. See RUNNING AS ROOT.

       -l --list-devices
              List all available devices for given driver. Requires support not  present  in  all

       -g --gap=time
              Treat spaces longer than time as the gap. Time is in microseconds.

       -r --raw
              Access  device  directly.  This  is  primarely  intended  to be used with kernel rc
              drivers i .e., when accessing /dev/lirc* devices. Using other devices  might  work,
              but is in general undefined.

       -A --driver-options=key:value[|key:value...]
              Set driver-specific option named key to given value.

       -U --plugindir=directory
              Load drivers from directory. See DRIVER LOADING.

       -O, --options-file <path>
              File containing default values for all options. A relative path is interpreted from
              current directory. See [FILES] below.

       -D --loglevel=level
              Determine the amount of logging information.  [level]  can  be  a  symbolic  syslog
              level:  'error','warning,  'info',  'notice'  or   'debug'. lirc also defines three
              additional levels 'trace', 'trace1' and 'trace2' which  gives  even  more  messages
              ('trace2'  bringing  the  most).  However,  in the log these messages are marked as
              'debug'.  The level can also be an integer in the range 3 (almost no  messages)  to

       -h --help
              Display usage summary.

       -v --version
              Display version.


       In many cases mode2 needs to run as root to access devices not available to regular users.
       On the other hand, running as root creates problems such  as  log  files  owned  by  root,
       security concerns etc.

       In order to cope with this, mode2 by default drops root privileges after opening the input
       device. This support is based on that root permissions are accquired using sudo(1) e.  g.,

               $ sudo mode2 --raw /dev/lirc0

       If  not  using  sudo,  the  same  behaviour  could  be  accomplished  using  the SUDO_USER
       environment variable e. g.,

               # SUDO_USER=$LOGNAME mode2 --raw /dev/lirc0

       The --keep-root option will make mode2 to keep root privileges for the complete run.


       Invoked with a MODE2 type driver with mode2 prints space/mark timings:
            al@snorken $ ./mode2 --driver default --device /dev/lirc0
            Using driver default on device /dev/lirc0
            Trying device: /dev/lirc0
            Using device: /dev/lirc0
            pulse 2750
            space 800
            pulse 500
            space 350
            pulse 550
            space 350
            pulse 550

       Invoked with a LIRCCODE type driver mode2 prints decoded values:

            $ ./mode2 --driver atilibusb
            Using driver atilibusb on device /dev/lirc0
            Trying device: /dev/bus/usb/001/007
            Using device: /dev/bus/usb/001/007
            code: 0x14709b0000
            code: 0x14709b0000
            code: 0x14709b0000
            code: 0x14709b0000
            code: 0x14709b0000

       Invoked using mode2 --list-devices for the devinput driver with a
       single X10 RF usb device plugged in:
           $ ./mode2 --list-devices --driver devinput
           /dev/input/event12 [0bc7:0006] X10 WTI RF receiver vers:  1.10 serial: ?
           /dev/input/by-id/usb-X10_WTI_RF_receiver-event-if00 -> ../event12
           /dev/input/by-path/pci-0000:0b:00.0-usb-0:1:1.0-event -> ../event12


       Drivers are loaded dynamically. The search path used for this is  determined  by  (falling

       - The --plugindir option.

       - The 'plugindir' entry in  the [lircd] section of the lirc_options.conf file.

       - The environment variable LIRC_PLUGINDIR.

       - A hardcoded default (/usr/lib/x86_64-linux-gnu/lirc/plugins).


           Used as fallback when there is no --loglevel option present. Syntax is the same as for
           --loglevel, see OPTIONS.


           The options file holding default values  for  command  line  options  in  the  [mode2]
           section.  For  some  values  including debug, plugindir, driver and device mode2 falls
           back to the [lircd] section if not found in [mode2].

           The location of this file can be  changed  using  the  -O/--options-file  command-line
           option or using the environment variable LIRC_OPTIONS_PATH.

           Debug  log.  Setting  the  XDG_CACHE_HOME  environment variable relocates this file to
           $XDG_CACHE_HOME/mode2.log.  The  amount  of   logging   respects   the   LIRC_LOGLEVEL
           environment variable, defaulting to the debug value in lirc_options.conf.



       The  documentation  for  lirc is maintained as html pages. They are located under html/ in
       the documentation directory.