A fix for my Sony Vaio! (Thank you Silvan for this solution)
1. Find out the vendor string used by hal:
$ lshal | grep system.hardware.vendor
(In my case: system.hardware.vendor = 'Sony Corporation )
2. Find out the product string:
$ lshal | grep system.hardware.product
(In my case: system.hardware.product = 'VGN-FW31ZJ' )
3. Open /usr/share/hal/fdi/information/10freedesktop/10-laptop-panel-
hardware.fdi in an editor with root privileges
4. Add this line
<match key="/org/freedesktop/Hal/devices/computer:system.hardware.vendor"
string="Sony Corporation">
<match
key="/org/freedesktop/Hal/devices/computer:system.hardware.product"
contains_outof="VGN-FW31ZJ">
<!-- 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>
</match>
</match>
5. Reboot!
--
[LUCID Beta 1] Brightness Fn keys don't work as expected on Sony Vaio VGN
FW35G. Regression.
https://bugs.launchpad.net/bugs/546201
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