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[Launchpad Bug Tracker <778026@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/lirc

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https://bugs.launchpad.net/bugs/778026

Title:
  lirc-modules-source breaks in-kernel lirc support

Status in “lirc” package in Ubuntu:
  Fix Released
Status in “lirc” source package in Natty:
  Triaged
Status in “lirc” source package in Oneiric:
  Fix Released

Bug description:
  Binary package hint: lirc-modules-source

  Ubuntu 11.04 is shipping with a 2.6.38 kernel, which has numerous lirc
  device drivers from the staging tree enabled, as well as rc-core
  infrastructure and several new rc-core device drivers. The rc-core
  drivers and the in-kernel lirc device drivers rely on the lirc device
  interface driver (lirc_dev.ko) provided by the kernel to provide the
  lirc character device interface needed by lircd.

  Also shipping is an lirc-modules-source package, based on lirc
  0.8.7-era out-of-tree lirc device driver code. When this package is
  installed and dkms builds modules, they override the in-kernel ones,
  most troubling being lirc_dev.ko:

  # find /lib/modules/$(uname -r)/ -name lirc_dev.ko
  /lib/modules/2.6.38-8-generic/kernel/drivers/media/rc/lirc_dev.ko
  /lib/modules/2.6.38-8-generic/updates/dkms/lirc_dev.ko

  Now when any of the in-kernel lirc drivers or an rc-core driver with
  support for the ir-lirc-codec bridge driver tries to load, you get
  something like the following:

  # modprobe ir-lirc-codec
  FATAL: Error inserting ir_lirc_codec (/lib/modules/2.6.38-8-generic/kernel/drivers/media/rc/ir-lirc-codec.ko): Unknown symbol in module, or unknown parameter (see dmesg)

  # dmesg | grep ir_lirc_codec
  [   13.439407] ir_lirc_codec: Unknown symbol lirc_dev_fop_poll (err 0)
  [   13.439557] ir_lirc_codec: Unknown symbol lirc_dev_fop_open (err 0)
  [   13.439622] ir_lirc_codec: disagrees about version of symbol lirc_get_pdata
  [   13.439623] ir_lirc_codec: Unknown symbol lirc_get_pdata (err -22)
  [   13.439706] ir_lirc_codec: Unknown symbol lirc_dev_fop_close (err 0)
  [   13.439770] ir_lirc_codec: Unknown symbol lirc_dev_fop_read (err 0)
  [   13.439824] ir_lirc_codec: disagrees about version of symbol lirc_register_driver
  [   13.439826] ir_lirc_codec: Unknown symbol lirc_register_driver (err -22)
  [   13.439960] ir_lirc_codec: Unknown symbol lirc_dev_fop_ioctl (err 0)

  This completely breaks in-kernel drivers' lirc support.

  Please either stop shipping lirc-modules-source, or properly update it
  to build against the in-kernel lirc bits (and preferably, strip out
  the entirely redundant drivers).