[ltp] Updates on the X60,T60 BIOS 2.x brightness up issues

[Henrique de Moraes Holschuh]

"Puyan" added a page to ThinkWiki, so I took the time to update it with more
up-to-date information on the problem the new ThinkPad BIOSes are having
with Linux and "brighness up" keys.

To be short and sweet: the kernel ACPI video support is fubar before 2.6.20.
Remove it, and all will work.  ibm-acpi is not to blame in this particular
issue :-)

More details at:
http://thinkwiki.org/wiki/Problem_with_LCD_brightness_buttons

Thanks to all the *60 owners that are helping track this down.  Note that
not all questions surrounding this issue are answered yet.  We don't know if
a quirk (or ibm-acpi interference, if the API allows that) is needed to
disable kernel ACPI video handling for some ThinkPad events, for example.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh