Public bug reported:

Binary package hint: udev

OS Version: Ubuntu Maverick Meerkat 10.10 i386

Problem:  When pressing the Fn+F5 hotkey on a Dell Latitude E-series
laptop to toggle the touchpad, the correct keycode is sent, but, the
touchpad does not respond.  Instead, there are other side effects such
as loss of keyboard that occur.

Details:

The laptop is using an ALPS touchpad, which present themselves to the
operating system as ImPS/2 ALPS GlidePoint Devices.

Steps taken to reproduce:

1) Press Fn+F5 to try and disable the touchpad.

2) This does not disable the touchpad, but, the side effect is that the
keyboard stops working to some degree.  For example, if you have a
terminal window open when pressing Fn+F5, you can no longer type
anything into the terminal window.  The other side effect is that
although the mouse pointer still works, you cannot click on anything
either by tapping the touchpad or clicking the mouse buttons below the
touchpad.

3) To clear this, press Ctrl+Alt+F1, then Ctrl+Alt+F7.   You will then
be able to use the keyboard again on the desktop.  Also, note that the
notification icon shows up in the upper right corner of the screen
showing "touchpad off", even though the touchpad was never really
disabled (this is a different problem).

4) After restoring keyboard functionality by running through the above
in step #3, Fn+F5 does not respond again until the system is rebooted.

Per a conversation with Martin Pitt on this issue,  he requested I open
a udev bug regarding what appears to be some sort of 'stuck' key issue
that could possibly be addressed with udev.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: udev 162-2
ProcVersionSignature: Ubuntu 2.6.35-23.40-generic-pae 2.6.35.7
Uname: Linux 2.6.35-23-generic-pae i686
Architecture: i386
Date: Tue Dec  7 10:46:20 2010
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-dell-maverick-une-20101022-0
InstallationMedia: Ubuntu 10.10 "Maverick" - Build i386 LIVE Binary 
20101022-01:50
MachineType: Dell Inc. Latitude E5520
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic-pae 
root=UUID=a6df1b8d-a093-4087-ba51-90e1d9305da3 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: udev
dmi.bios.date: 12/03/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X16
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrX16:bd12/03/2010:svnDellInc.:pnLatitudeE5520:pvr01:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5520
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

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


** Tags: apport-bug i386 maverick ubuntu-une

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https://bugs.launchpad.net/bugs/686662

Title:
  Fn+F5 sends correct keycode, but, touchpad is not disabled / enabled

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