backlight fn keys not working on sony vaio with nouveau driver

[Schmirrwurst]

Binary package hint: devicekit

I'm using nouveau as xorg driver. The driver manage properly backlight, I can change it from the power management plasmoid (on kde), but fn keys are not working

using acpi_listen,
brightness down is giving :
sony/hotkey SNC 00000001 00000010
sony/hotkey SNC 00000001 0000003b

brightness up :
sony/hotkey SNC 00000001 00000011
sony/hotkey SNC 00000001 0000003b

in dmesg, I've seen the following, I don't know if it is linked :
ACPI: EC: missing confirmations, switch off interrupt mode.

ProblemType: Bug
Architecture: amd64
Date: Wed Nov 4 19:24:07 2009
DistroRelease: Ubuntu 9.10
Package: devicekit-power 011-1ubuntu1
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: devicekit-power
Uname: Linux 2.6.31-14-generic x86_64

[Schmirrwurst (schmirrwurst)]

root@karmic:~# cat /sys/class/dmi/id/product_name
VGN-FZ21E

Udev keymap seems ok : (/input/event4)
scan code: 0x00 key code: brightnessdown
scan code: 0x10 key code: brightnessup

[Martin Pitt (pitti)]

Key codes okay, manual setting of brightness is okay, so it seems that this is somehow a bug in the KDE hotkey integration.