Public bug reported:
Failed to adjust brightness.
Unable to change brightness with hotkeys or even system settings.
Additional information:
There are two backlight interfaces and the system seems to use the wrong one.
/sys/class/backlight$ ls
acpi_video0 intel_backlight
Following commands proof that intel interfaces can controll the backlight:
sudo sh -c "echo 2500 >> /sys/class/backlight/intel_backlight/brightness"
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.13.0-65.106-generic 3.13.11-ckt26
Uname: Linux 3.13.0-65-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Tue Oct 6 15:25:21 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation ValleyView Gen7 [8086:0f31] (rev 0e) (prog-if 00 [VGA
controller])
Subsystem: Dell Device [1028:06d7]
InstallationDate: Installed on 2015-10-05 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Inspiron 5551
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-65-generic.efi.signed
root=UUID=2e69c3f8-b60b-4e26-beed-33717212e1e9 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/28/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X16
dmi.board.asset.tag: AFTPASS
dmi.board.name: Type2 - Board Product Name1
dmi.board.vendor: Dell Inc.
dmi.board.version: Type2 - Board Version
dmi.chassis.asset.tag: AFTPASS
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: X16
dmi.modalias:
dmi:bvnDellInc.:bvrX16:bd01/28/2015:svnDellInc.:pnInspiron5551:pvrX16:rvnDellInc.:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnDellInc.:ct8:cvrX16:
dmi.product.name: Inspiron 5551
dmi.product.version: X16
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Tue Oct 6 14:20:56 2015
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 5100
vendor AUO
xserver.version: 2:1.15.1-0ubuntu2.7
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: 201501-16349 amd64 apport-bug blocks-hwcert compiz-0.9 trusty ubuntu
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1503168
Title:
[Dell Inspiron 5551][8086:0f31] Unable to adjust brightness
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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1503168/+subscriptions
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