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[Launchpad Bug Tracker <1441849@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 219-7ubuntu4

---------------
systemd (219-7ubuntu4) vivid; urgency=medium

  * hwdb: Fix wireless switch on Dell Latitude (LP: #1441849)
  * Fix assertion crash when reading a service file with missing ' and
    trailing space. (LP: #1447243)
  * Fix double free crash in "systemctl enable" when calling update-rc.d and
    the latter fails. (LP: #1426588)
 -- Martin Pitt <martin.pitt@xxxxxxxxxx>   Thu, 23 Apr 2015 11:14:16 +0100

** Changed in: systemd (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1441849

Title:
  Update force_release for Dell Latitudes

Status in systemd package in Ubuntu:
  Fix Released
Status in udev package in Ubuntu:
  Invalid
Status in udev source package in Precise:
  Triaged
Status in systemd source package in Trusty:
  Triaged
Status in systemd source package in Vivid:
  Fix Released

Bug description:
  Wireless HW switch on Dell Latitude notebooks generate key press event
  via AT Translated Set 2 keyboard, but does *not* generate release key
  event. This means that operating systems and applications see key
  still pressed.

  Scan code of that problematic key is 136 (0x88).

  Fixing this problem can be done via force_release option of atkbd
  kernel driver (by adding 136 scan code to list)

  Kernel developers told me that now only userspace (udev package)
  maintains list of those problematic scan codes and so udev needs to be
  extended/patched to add new values to atkbd kernel driver at runtime.
  See: https://lkml.org/lkml/2015/4/5/157

  Currenly there is file /lib/udev/keymaps/force-release/dell-touchpad
  which contains some force_release scan code for all dell latitude
  notebooks handled by file /lib/udev/rules.d/95-keyboard-force-
  release.rules by rule:

  ENV{DMI_VENDOR}=="Dell Inc.",
  ATTR{[dmi/id]product_name}=="*Latitude*|*Precision*", RUN+="keyboard-
  force-release.sh $devpath dell-touchpad"

  Can you extend either /lib/udev/keymaps/force-release/dell-touchpad or
  /lib/udev/rules.d/95-keyboard-force-release.rules to include also scan
  code 136 (0x88)? Because without is there are problems with HW
  wireless switch!

  This problem was tested on Ubuntu 12.04.5 LTS Precise release.

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