I can confirm this problem on a Macbook Air 1,1, running Intrepid with
kernel 2.6.27-5-generic.
After starting X, nothing happens when pressing the LCD panel keys - you
think. After about one minute (!), the key presses you already forgot
about suddenly takes effect, and the screen brightness is adjusted. From
this point on, pressing the LCD panel keys works well and as you would
expect. Also after several suspend/resume cycles, the keys stay
responsive.
During that first odd startup time, pressing the volume keys works, but
pressing the keyboard backlight keys does not work. However, after the
system is done doing whatever it does that first minute, also the
keyboard backlight keys work well (note to reproducer: keyboard
backlight does not yet work on MBA, am sending my fix upstream).
Because of the connection to the keyboard backlight, which is controlled
via hal and a proper fdi configuration, I suspect the culprit here is
hal. I do not know what part of power management that eventually ends up
modifying the LCD brightness, but since there is no laptop_panel
capability listed when running hal-find-by-capability, I suspect the
minute-long wait could have something to do with patient searching for
the right device.
Am I wrong?
** Also affects: hal
Importance: Undecided
Status: New
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brightness Applet very slow and processors getting bisy when try adjust LCD
brightness
https://bugs.launchpad.net/bugs/261450
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