[Bug 1229591] [NEW] display brightness keys stop working after saucy upgrade

[Chris Stratford]

Public bug reported:

On raring (and precise) the display brightness keys (fn+f4 and fn+f5) on
my Dell Inspiron 14z turned the brightness up and down.  After a saucy
upgrade this no longer happens (I don't see the popup brightness bubble
either).  The other, similar keys (volume adjustment, etc) still work
fine.

Changing the values in /sys/class/backlight/intel_backlight/brightness
works (temporarily - it gets reset after the screen lock kicks in)

I tried following the instructions in
https://wiki.ubuntu.com/Hotkeys/Troubleshooting but this appears to be
out of date (it references /usr/share/doc/udev/README.keymap.txt which
does not exist)

$ lsb_release -rd
Description:	Ubuntu Saucy Salamander (development branch)
Release:	13.10

$ apt-cache policy udev
udev:
  Installed: 204-0ubuntu12
  Candidate: 204-0ubuntu12
  Version table:
 *** 204-0ubuntu12 0
        500 http://gb.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1229591

Title:
  display brightness keys stop working after saucy upgrade

Status in “udev” package in Ubuntu:
  New

Bug description:
  On raring (and precise) the display brightness keys (fn+f4 and fn+f5)
  on my Dell Inspiron 14z turned the brightness up and down.  After a
  saucy upgrade this no longer happens (I don't see the popup brightness
  bubble either).  The other, similar keys (volume adjustment, etc)
  still work fine.

  Changing the values in /sys/class/backlight/intel_backlight/brightness
  works (temporarily - it gets reset after the screen lock kicks in)

  I tried following the instructions in
  https://wiki.ubuntu.com/Hotkeys/Troubleshooting but this appears to be
  out of date (it references /usr/share/doc/udev/README.keymap.txt which
  does not exist)

  $ lsb_release -rd
  Description:	Ubuntu Saucy Salamander (development branch)
  Release:	13.10

  $ apt-cache policy udev
  udev:
    Installed: 204-0ubuntu12
    Candidate: 204-0ubuntu12
    Version table:
   *** 204-0ubuntu12 0
          500 http://gb.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
          100 /var/lib/dpkg/status

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