Comment 0 for bug 629358

1) Kubuntu maverick beta
2) 2.6.35.19.20 0
3) Pressing the brightness keys should increase/decrease the brightness by 1 step
4) Pressing brightness-down decreases brightness by two steps, pressing brightness-up increases the brightness for a split-second, then decreases it back to what it was. It's impossible to increase brightness using the keys, I have to increase by other means (powerdevil slider, xrandr --set, etc..)

Hardware: Notebook Fujitsu-Siemens Esprimo mobile U9200 (intel GM965)
Annotated showkey - s output:
# single brightness-down
0xe0 0x4c 0xe0 0xcc
#single brighness-up
0xe0 0x54 0xe0 0xd4 0xe0 0x4c 0xe0 0xcc

Tried "acpi-backlight=vendor" option to no avail. Worked fine way back before intel KMS (Kubuntu 8.04). Xrandr show two backlight properties, in case that's relevant:

$ xrandr --prop
...
LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 261mm x 163mm
        EDID:
      ...
        BACKLIGHT: 7 (0x00000007) range: (0,7)
        Backlight: 7 (0x00000007) range: (0,7)
...

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-19-generic 2.6.35-19.28
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
Uname: Linux 2.6.35-19-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: michal 1751 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc400000 irq 47'
   Mixer name : 'Realtek ALC262'
   Components : 'HDA:10ec0262,17340000,00100202'
   Controls : 16
   Simple ctrls : 11
Date: Fri Sep 3 10:39:43 2010
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100902.1)
MachineType: FUJITSU SIEMENS ESPRIMO Mobile U9200
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-19-generic root=UUID=c34e4451-0744-48d0-9912-745565e9441e ro acpi-backlight=vendor quiet splash
ProcEnviron:
 LANGUAGE=
 LANG=sk_SK.UTF-8
 LC_MESSAGES=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
dmi.bios.date: 04/22/2008
dmi.bios.vendor: Phoenix
dmi.bios.version: 1.11 - 067 - 1566
dmi.board.name: S11D
dmi.board.vendor: FUJITSU SIEMENS
dmi.board.version: 1.0
dmi.chassis.asset.tag: FSC
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU SIEMENS
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnPhoenix:bvr1.11-067-1566:bd04/22/2008:svnFUJITSUSIEMENS:pnESPRIMOMobileU9200:pvr1.0:rvnFUJITSUSIEMENS:rnS11D:rvr1.0:cvnFUJITSUSIEMENS:ct10:cvr1.0:
dmi.product.name: ESPRIMO Mobile U9200
dmi.product.version: 1.0
dmi.sys.vendor: FUJITSU SIEMENS