[Bug 1229591] Re: [keymap] display brightness keys stop working after saucy upgrade

[Chris Stratford]

$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:	Power Button
/dev/input/event1:	Sleep Button
/dev/input/event2:	Lid Switch
/dev/input/event3:	Power Button
/dev/input/event4:	AT Translated Set 2 keyboard
/dev/input/event5:	Video Bus
/dev/input/event6:	HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event7:	HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event8:	HDA Intel PCH Headphone
/dev/input/event9:	HDA Intel PCH Mic
/dev/input/event10:	Dell WMI hotkeys
/dev/input/event11:	SynPS/2 Synaptics TouchPad
/dev/input/event12:	Laptop_Integrated_Webcam_HD
Select the device event number [0-12]: 10
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x0 version 0x0
Input device name: "Dell WMI hotkeys"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 148 (KEY_PROG1)
    Event code 149 (KEY_PROG2)
    Event code 161 (KEY_EJECTCD)
    Event code 224 (KEY_BRIGHTNESSDOWN)
    Event code 225 (KEY_BRIGHTNESSUP)
    Event code 227 (KEY_SWITCHVIDEOMODE)
    Event code 236 (KEY_BATTERY)
    Event code 238 (KEY_WLAN)
    Event code 240 (KEY_UNKNOWN)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
Properties:
Testing ... (interrupt to exit)

It displayed nothing when I pressed the keys.  I also tried choosing
event4 with the same result (or rather, lack of result)


** Attachment added: "Output from "udevadm info --export-db""
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1229591/+attachment/3837828/+files/udev.txt

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

Title:
  [keymap] display brightness keys stop working after saucy upgrade

Status in “systemd” package in Ubuntu:
  Incomplete

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  out of date (it references /usr/share/doc/udev/README.keymap.txt which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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