Hi Christopher,

The problem did not reappear since filing of the bug.
I booted the current daily trusty-desktop-amd64.iso - no stuck keys.

I get the impression that the described behaviour might be hardware related to 
the Cherry Keyboard.
I feel fine, if you close the bug.

Thank you for your efforts

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-input-evdev in Ubuntu.
https://bugs.launchpad.net/bugs/1009975

Title:
  Multimedia keys get stuck and cause system to hang at log-out

Status in “xserver-xorg-input-evdev” package in Ubuntu:
  Incomplete

Bug description:
  Multimedia send no "button released" (Cherry Cymotion Master Linux Keyboard).
  When pressing "vol +" (for example) volume gets increased to max. button 
keeps "stuck". regular keys are unusable.
  switching to console (Ctrl+Alt+F1) and back makes regular keys usable again.
  Turning the volume wheel on my Logitech headset makes regular keys usable 
again.
  Other multimedia keys (Calc., Mail, Play, etc.) show a same problem.
  Once a key is pressed, logging out of current session causes system to hang.

  Same result in Unity and Gnome Shell.

  Bug was dicovered yesterday after fresh install of Precise.

  Problem also existed in Oneric. That time installing evdev from ppa in
  http://ubuntuforums.org/showthread.php?t=974723 solved the problem.
  Switched to Mint 12 --> Same behaviour. ppa helped so I guess it's the
  same bug.

  After booting into recovery mode the problem did not reappear.

  What I did:
  Fresh install. Install medibuntu etc. Install gnome-shell and ATI fglrx.
  Discovered the problem in gnome shell. Switched to console and back. found 
the Headset wheel releases the key. Log out --> Hang.
  Reset. login to gnome shell. reproduced the behaviour. -->Hang
  Reset. login to unity. reproduced the behaviour. -->Hang
  gnome shell again.-->Hang
  Boot into Recovery Mode (unity). Problem disappeared.

  lsb_release -rd:
  Description:  Ubuntu 12.04 LTS
  Release:      12.04

  apt-cache policy xserver-xorg-input-evdev:
  xserver-xorg-input-evdev:
    Installiert: 1:2.7.0-0ubuntu1
    Kandidat:    1:2.7.0-0ubuntu1
    Versionstabelle:
   *** 1:2.7.0-0ubuntu1 0
          500 http://de.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
          100 /var/lib/dpkg/status

  Bug filing was initiated by  ubuntu-bug xserver-xorg-input-evdev.

  Thank you for your work. If the bug reappears i will give you an
  update.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic-pae 3.2.16
  Uname: Linux 3.2.0-24-generic-pae i686
  NonfreeKernelModules: fglrx
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: i386
  Date: Thu Jun  7 13:50:21 2012
  DistroCodename: precise
  DistroVariant: ubuntu
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423)
  ProcEnviron:
   LANGUAGE=de_DE:en
   TERM=xterm
   PATH=(custom, user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: xserver-xorg-input-evdev
  UpgradeStatus: No upgrade log present (probably fresh install)

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