Ok, so I upgraded my Lenovo w510 to Ubuntu 16.04 LTS Xenial Xerus and
the problem persists. The fix I provide works, though when changing the
brightness, it is jerky, i.e. it flashes between a low level and the
actual selected level. But once the desired level reached, all is good.
So, can we finally introduce my fix into 14.04 and 16.04? At least, it
provides a mean to change the brightness.
** Description changed:
+ Affects: Ubuntu 16.04 and 14.04.
+ Occurs only with Nvidia proprietary driver. Nouveau works well.
+
Brightness controls are not working in Unity / Xorg. When pressing the
keys <fn><home> and <fn><end> on my Lenovo W510, I see the indicator on
the screen showing the level of brightness changing, so key mapping is
not the problem. However, the brightness is not changing.
On the kernel level, I have the single following device:
# cd /sys/class/backlight
# ls -l
total 0
lrwxrwxrwx 1 root root 0 Nov 3 17:16 acpi_video0 ->
../../devices/pci0000:00/0000:00:03.0/0000:01:00.0/backlight/acpi_video0
When playing with the <fn><home> and <fn><end>, the value of
/sys/class/backlight/brightness changes accordingly. The screen
brightness does not change.
Performing:
# echo 10 >brightness
...does not have any effect (regardless of the value provided, 10 being
just an example).
WORKAROUND
There is an odd workaround. Simply go to the console using
<CTRL><ALT><F1> and using the <fn><home> and <fn><end> keys, brightness
then changes. Return to Unity / Xorg with <CTRL><ALT><F7> and the
selected brightness persists.
NON WORKING WORKAROUND
On the web, I read that adding:
Option "RegistryDwords" "EnableBrightnessControl=1"'
in xorg.conf might fix the problem. I do not have an xorg and when I
let the proprietary Nvidia driver generate one and add this option, X
does not start anymore.
Ubuntu 14.04.1 LTS with latest updates as of this writing.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
NonfreeKernelModules: nvidia
.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 331.38 Wed Jan 8 19:32:30
PST 2014
GCC version: gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
.tmp.unity.support.test.0:
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CompizPlugins:
[core,bailer,detection,composite,opengl,compiztoolbox,decor,place,put,snap,resize,move,regex,session,vpswitch,imgpng,gnomecompat,text,ring,grid,mousepoll,animation,unitymtgrabhandles,wall,expo,ezoom,workarounds,fade,scale,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Nov 4 07:38:59 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
bbswitch, 0.7, 3.13.0-32-generic, x86_64: installed
bbswitch, 0.7, 3.13.0-39-generic, x86_64: installed
nvidia-331, 331.38, 3.13.0-32-generic, x86_64: installed
nvidia-331, 331.38, 3.13.0-39-generic, x86_64: installed
tp-smapi, 0.41, 3.13.0-32-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
NVIDIA Corporation GT216GLM [Quadro FX 880M] [10de:0a3c] (rev a2) (prog-if
00 [VGA controller])
Subsystem: Lenovo Device [17aa:2145]
InstallationDate: Installed on 2014-11-01 (3 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.2)
MachineType: LENOVO 4318CTO
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-39-generic
root=UUID=994f9c2c-f967-472e-ace3-23cd620ec702 ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/03/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 6NET84WW (1.45 )
dmi.board.name: 4318CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr6NET84WW(1.45):bd10/03/2012:svnLENOVO:pn4318CTO:pvrThinkPadW510:rvnLENOVO:rn4318CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4318CTO
dmi.product.version: ThinkPad W510
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
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
2:2.99.910-0ubuntu1.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.10-1ubuntu2
xserver.bootTime: Tue Nov 4 01:40:35 2014
xserver.configfile: default
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
xserver.version: 2:1.15.1-0ubuntu2.1
** Changed in: nvidia
Status: Incomplete => New
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1389215
Title:
Brightness controls are not working in Unity / Xorg because of Nvidia
proprietary driver.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nvidia/+bug/1389215/+subscriptions
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