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Ubuntu 9.10 with latest updates, booted with KMS, provides /sys/devices/virtual/backlight/acpi_video0 interface, but changing 
/sys/devices/virtual/backlight/acpi_video0/brightness has no effect (pressing brightness keys in Gnome says that it changes brightness, but there is no visual effect).
Booting with i915.modeset=0 and then xrandr --output LVDS --set BACKLIGHT_CONTROL legacy
allows to change display brightness, but I get blinking screen on console (Alt-Ctrl-F1)
The trick with 
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
setpci -s 00:02.0 F4.B=80
works. 

> lsb_release -rd
Description:	Ubuntu 9.10
Release:	9.10
> uname -a
Linux sergey-laptop 2.6.32-020632-generic #020632 SMP Thu Dec 3 10:09:58 UTC 2009 x86_64 GNU/Linux
> lspci -vvnn
...
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
	Subsystem: Samsung Electronics Co Ltd Device [144d:c03e]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 29
	Region 0: Memory at fc000000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 1800 [size=8]
	Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+
		Address: fee0300c  Data: 41a1
	Capabilities: [d0] Power Management version 3
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: i915
	Kernel modules: i915

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
samsung x360-aa03 backlight control does not work with KMS
https://bugs.edge.launchpad.net/bugs/508737
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