Hi,

In Precise kernel, it already provided an interface to turn on/off the 
tourchpad LED
   /sys/class/leds/dell-laptop::touchpad/brightness

Other patches are just quirks to add more machines to have this
interface, so I don't think it's so urgent.

The problem is that there is no userspace app to take care of this
interface, and to turn on/off the LED while touchpad toggle events
happened.

It's not suitable to let driver handle this, for it can't access the led
subsystem while receiving the key events.

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https://bugs.launchpad.net/bugs/914348

Title:
  Touchpad LED on Dell's laptop is not working

Status in “gnome-settings-daemon” package in Ubuntu:
  Confirmed

Bug description:
  In some of Dell laptops, they support a touchpad LED to indicate the 
enablement/disablement of the touchpad.
  And kernel(after 3.2) supports an interface to turn on/off the LED, user 
space app should take the responsibility to handle this,
  and I think gnome-settings-daemon is the best one.

  The interface is in /sys
  To turn on the LED
      echo 1 > /sys/class/leds/dell-laptop::touchpad/brightness
  To turn it off
      echo 0 > /sys/class/leds/dell-laptop::touchpad/brightness

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/914348/+subscriptions

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