Thank you, silvan. It worked on my HP Compaq 6735b too. I am writing
below what I did. Combined from silvan's posts.
$ sudo killall gnome-power-manager
$ gnome-power-manager --verbose
I pushed brightness keys(Fn+F9/F10) on the keyboard, the brightness
scale popped up on the screen
$ lshal | grep system.hardware.vendor
system.hardware.vendor = 'Hewlett-Packard' (string)
$ lshal | grep system.hardware.product
system.hardware.product = 'HP Compaq 6735b' (string)
$ sudo gedit /usr/share/hal/fdi/information/10freedesktop/10-laptop-
panel-hardware.fdi
<match key="/org/freedesktop/Hal/devices/computer:system.hardware.vendor"
string="Hewlett-Packard"> // my vendor 'Hewlett-Packard'
<match
key="/org/freedesktop/Hal/devices/computer:system.hardware.product"
contains_outof="2510p;2710p;nc2400">
<merge key="laptop_panel.brightness_in_hardware"
type="bool">true</merge>
</match>
<match
key="/org/freedesktop/Hal/devices/computer:system.hardware.product"
contains_outof="6735b;4410s;4415s;4416s;Compaq 5X5"> //added '6735b' to this
list
<!-- needed since the acpi video module reports it handle the events,
but it don't work on this machines-->
<merge key="laptop_panel.brightness_in_hardware"
type="bool">false</merge> //here is false
</match>
</match>
After that I saved the changes and rebooted.
--
Cannot adjust brightness in Lucid Lynx
https://bugs.launchpad.net/bugs/555122
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