Update -
# ls /sys/class/backlight has three listings
acpi_video0 acpi_video1 intel_backlight
# cat /sys/class/backlight/intel_backlight/max_brightness
976
# echo 100 > /sys/class/backlight/intel_backlight/brightness
bash: /sys/class/backlight/intel_backlight/brightness: Permission denied
# sudo -s
root# echo 100 > /sys/class/backlight/intel_backlight/brightness
This last command worked and my brightness was changed successfully. I
tried other values too, and they all seem to work. I didn't try going
beyond the max_brightness value, of course.
Is there something else I could try that would help in narrowing down
and / or fixing this bug?
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1207487
Title:
Brightness Controls work but brightness doesnt change
Status in “xserver-xorg-video-intel” package in Ubuntu:
Confirmed
Bug description:
I am unable to change the brigthness of the screen, the controls work
properly but changing the brightness level has no impact on the screen
brightness. It feels like the old intel brightness regression bug. The
brightness is always at the full level.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu5
ProcVersionSignature: Ubuntu 3.10.0-5.15-generic 3.10.2
Uname: Linux 3.10.0-5-generic x86_64
ApportVersion: 2.11-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Fri Aug 2 00:35:28 2013
DistUpgraded: Fresh install
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
bbswitch, 0.7, 3.10.0-3-generic, x86_64: installed
bbswitch, 0.7, 3.10.0-4-generic, x86_64: installed
bbswitch, 0.7, 3.10.0-5-generic, x86_64: installed
nvidia-304, 304.88, 3.10.0-4-generic, x86_64: installed
nvidia-304, 304.88, 3.10.0-5-generic, x86_64: installed
DpkgLog:
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:397d]
NVIDIA Corporation GF108M [GeForce GT 520M] [10de:0df7] (rev ff) (prog-if ff)
InstallationDate: Installed on 2013-06-02 (60 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Alpha amd64
(20130601)
MachineType: LENOVO HuronRiver Platform
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.10.0-5-generic
root=UUID=f80879ea-b397-4778-bb59-f9fb5c8fa4ce ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 45CN38WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Emerald Lake
dmi.board.vendor: LENOVO
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnLENOVO:bvr45CN38WW:bd10/21/2011:svnLENOVO:pnHuronRiverPlatform:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
dmi.product.name: HuronRiver Platform
dmi.product.version: Ideapad Z570
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.45-2ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.4-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.4-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.2-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.9-0ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.8-0ubuntu1.1
xserver.bootTime: Thu Aug 1 22:15:43 2013
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.14.2-0ubuntu1
xserver.video_driver: intel
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