FN UpArrow and DownArrow shortcut for screen brightness is broken

[donkeykong]

When i updated from kernel 3.2.0-26 to 3.2.0-27 i found that my screen brightness shortcut (FN UP and DOWN) was no longer functioning correctly. It can now only have one of two states full brightness and the step below that.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
Uname: Linux 3.2.0-30-generic x86_64
NonfreeKernelModules: nvidia wl
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.40 Thu Apr 5 21:37:00 PDT 2012
 GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,gnomecompat,place,regex,move,session,vpswitch,mousepoll,imgpng,grid,unitymtgrabhandles,resize,wall,animation,workarounds,wobbly,expo,fade,ezoom,scale]
CompositorRunning: None
Date: Tue Sep 11 23:16:33 2012
DistUpgraded: 2012-05-02 08:06:14,196 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Samsung Electronics Co Ltd Device [144d:c0a2]
   Subsystem: Samsung Electronics Co Ltd Device [144d:c0a2]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
JockeyStatus: kmod:wl - Broadcom STA wireless driver (Proprietary, Enabled, In use) [auto-install]
MachineType: SAMSUNG ELECTRONICS CO., LTD. RC410/RC510/RC710
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-30-generic root=UUID=0eed5407-8c26-4eb0-a9e7-84b9f95bc671 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UnitySupportTest:
 Error: command ['/usr/lib/nux/unity_support_test', '-p', '-f'] failed with exit code 5: Xlib: extension "GLX" missing on display ":0.0".
 Error: GLX is not available on the system
UpgradeStatus: Upgraded to precise on 2012-05-01 (132 days ago)
XorgConf:
 Section "Device"
  Identifier "Default Device"
  Option "NoLogo" "True"
 EndSection
dmi.bios.date: 01/19/2011
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03HU.M008.20110119.KSY
dmi.board.asset.tag: Tag 12345
dmi.board.name: RC410/RC510/RC710
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr03HU.M008.20110119.KSY:bd01/19/2011:svnSAMSUNGELECTRONICSCO.,LTD.:pnRC410/RC510/RC710:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnRC410/RC510/RC710:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: RC410/RC510/RC710
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.7.8-0ubuntu1.4
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.3+8.0.2-0ubuntu3.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.3+8.0.2-0ubuntu3.2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Chris Wilson (ickle)]

First step will be to verify that setting the brightness manually (either using xrandr or through /sys/class/backlight/*/brightness) is still functioning correctly. If that is, we can assert that the bug lies in the ACPI handling of the key presses. Otherwise, the bug lies somewhere in the chain of applying the brightness (which may lead us back to ACPI again...).

[eSe (snaker)]

I cant change the brightness with Fn keys.

Set manually /sys/class/backlight/*/brightness works

Im using raring development version.

2:2.21.4-0ubuntu1 xserver-xorg-video-intel

[Launchpad Janitor (janitor)]

[Expired for xserver-xorg-video-intel (Ubuntu) because there has been no activity for 60 days.]