Can't set backlight since /proc/acpi deprecation

[holmberm]

Hi,
I'm running gentoo-sources-2.6.39-r3 on my samsung nc20. Before, on a 2.6.35 (or some such) kernel, I could set lcd brightness by echo:ing the desired number to the backlight file in /proc/acpi/whatever... (I can be more specific if it would help anybody help me but I expect this is useless information...). I understand that these nice files in /proc/acpi have been deprecated, supposedly to be replaced by stuff in /sys/. I do have a /sys/class/backlight directory, but it is empty.
I've also seen a "samsung-laptop" module that supposedly is to set brightness and lots of other stuff, It won't load however, and I don't really want it anyway. I want this nice generic way of setting brightness that's worked on all of my laptops for years with the same shellscripts controlling it:)

I'll post my kernel .config below so you can see if I've missed something that would make /sys/class/backlight work. Otherwise, are there any patches one could apply to get the /proc/acpi things back? Or should I install an ancient kernel instead...? ;)

.config: http://pastebin.com/iQmJduWb

Here is the lspci vga output for good measure:
00:01.0 VGA compatible controller: VIA Technologies, Inc. VX800/VX820 Chrome 9 HC3 Integrated Graphics (rev 11) (prog-if 00 [VGA controller])
Subsystem: Samsung Electronics Co Ltd Device c04e
Flags: bus master, fast devsel, latency 32, IRQ 16
Memory at f0000000 (32-bit, prefetchable) [size=128M]
Memory at fc000000 (32-bit, non-prefetchable) [size=16M]
Memory at f8000000 (32-bit, non-prefetchable) [size=64M]
[virtual] Expansion ROM at 40000000 [disabled] [size=64K]
Capabilities: [60] Power Management version 2
Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
Kernel driver in use: viafb
Kernel modules: viafb

Thanks
/Mattias