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[Sam Bull <fox_yrjkmk@xxxxxxxxxxxxx>]

I have noticed this problem also, since I got my laptop back on Ubuntu
10.10, and it is still a problem on 11.10. The only difference is I am
not giving it any input, it wakes up on it's own.

I remember back in 10.10, with a friend, we tried to debug the problem.
We first looked at some logs, whenever the screen turned back on, there
was a message something like, "X no longer idle". The only reason my
friend could think of, for the X server to not be idle is that it
received some input. So, we ran the program which shows any input
received (might have been xev?), and tested again, but this showed that
the system was not receiving any input. So, we were unable to work out
why X is would stop being idle (and turn the screen back on).

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Packages, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/41994

Title:
  closed Laptop Lid to reliably keep Backlight off

Status in The Dell Project:
  Invalid
Status in Xfce4 Power Manager:
  New
Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  Currently, on Dapper Beta 1, closing the laptop lid causes the
  backlight to shut off. However, for example when moving the mouse the
  backlight switches back on, even if the lid is still closed.

  The backlight should stay off as long as the lid is closed. There is
  no sense in trying to read a display in a closed lid.

  I am using a Dell Latitude X1.

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