The attached log file contains gpm debug information from the following
test case:

1) reduce brightness to zero
2) wait a bit
3) try to increase brightness - nothing happened
4) switch to tty1 and switch to X

Step 4 occurs at line 508 in attached file.

** Description changed:

  Binary package hint: gnome-power-manager
  
  I discovered that is possible to lower the brightness on my laptop, an
  HP DV6245US, using the brightness down key, Fn+F7, until a point where
  the brightness is zero or off.  After which pressing the brightness up
  key, Fn+F8, does not increase the brightness of the screen back thereby
  rendering my session unusable.  I think the brightness level should stop
  before it turns off.
  
  WORKAROUND:
  It is possible to workaround this issue by switching to a different vty, 
Ctrl+Alt+F1, and then back to my desktop session by pressing Ctrl+Alt+F7.  The 
brightness has then been restored to a normal level.
+ 
+ LATEST VERSION TESTED:
+ gnome-power-manager version 2.21.1-0ubuntu1

** Summary changed:

- possible to lower brightness all the way to off
+ after turning brightness off gpm does not respond to brightness up

** Attachment added: "gpm debug log"
   http://launchpadlibrarian.net/12149600/gpm.debug.log

-- 
after turning brightness off gpm does not respond to brightness up
https://bugs.launchpad.net/bugs/147772
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