Public bug reported:

My laptop is configured to lock the screen after X minutes. I lowered
the brightness until the point there the backlight is completely off,
and after X minutes I wanted to turn the screen again by using the
function keys to increase the brightness, but they weren't responding.
After a while I realized the screen was blocked, so I blindly type the
password, pressed enter and then used the function keys to increase the
brightness and it worked.

I think it will be much better if one can change the brightness of the
screen even if the screen is locked. I can't see any security problems
in allowing that. Optionally, it would be nice if the user can set his
lock screen to allow changing the sound volume and other slightly
harmless activities one can do with the function or multimedia keys
while the screen is locked (is a common thing in the mobile world, I
think).

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.5.0-22.33-generic 3.5.7.2
Uname: Linux 3.5.0-22-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.6.1-0ubuntu9
Architecture: amd64
CheckboxSubmission: f8b82cd9bc23fe075e5068a9824afda5
CheckboxSystem: b1865df84255b8716d3bcc269ff410d1
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom]
CompositorRunning: None
Date: Sun Jan 13 14:43:16 2013
DistUpgraded: 2012-10-28 16:30:42,684 DEBUG enabling apt cron job
DistroCodename: quantal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:0009]
InstallationDate: Installed on 2012-04-26 (261 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
MachineType: TOSHIBA SATELLITE Z830
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-22-generic 
root=UUID=36929bf3-a158-44d9-a80d-3adac2840fa8 ro quiet splash 
acpi_backlight=vendor i915.i915_enable_rc6=1 i915.lvds_downclock=1 vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to quantal on 2012-10-28 (76 days ago)
dmi.bios.date: 07/31/2012
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 1.70
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias: 
dmi:bvnTOSHIBA:bvrVersion1.70:bd07/31/2012:svnTOSHIBA:pnSATELLITEZ830:pvrPT22LE-00300GGR:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: SATELLITE Z830
dmi.product.version: PT22LE-00300GGR
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.8.6-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal ubuntu

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https://bugs.launchpad.net/bugs/1099115

Title:
  Can't change brightness while screen is locked

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