https://bugzilla.kernel.org/show_bug.cgi?id=34582





--- Comment #2 from Cedric Sodhi <[email protected]>  2011-05-10 19:58:40 ---
Update:

Surprisingly, rotating the display with xrandr in 90° steps does *not* have the
effect of increasing brightness to 100% when rotating to normal rotation!

xrandr --rotate inverted
xrandr --rotate normal
# => Backlight to 100% (though the next press of the function keys brings the
backlight to a level as if the value had been retained)

as opposed to

xrandr --rotate inverted
xrandr --rotate left
xrandr --rotate normal
# 90 deg steps => nothing happens.

A bug with further information has been created and confirmed on LP for Ubuntu

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/697514

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