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[BemNum <bemnum@xxxxxxxxx>]

Hello,

I have Asus R510L with Nvidia GeForce 840M and the problem exists. I use Ubuntu 14.04 and Unity.
1) I cannot modify brightness using Fn keys.
2) I also cannot change brightness using "System Settings" -> "Brightness and lock" -> "Brightness" slider

% uname -a
Linux lap 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
% sudo lspci -v| sed -ne '/NVIDIA/,/^$/ { p; }'
04:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev a2)
    Subsystem: ASUSTeK Computer Inc. Device 131d
    Flags: bus master, fast devsel, latency 0, IRQ 70
    Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at f0000000 (64-bit, prefetchable) [size=32M]
    I/O ports at c000 [size=128]
    [virtual] Expansion ROM at f7000000 [disabled] [size=512K]
    Capabilities: [60] Power Management version 3
    Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [78] Express Endpoint, MSI 00
    Capabilities: [100] Virtual Channel
    Capabilities: [250] Latency Tolerance Reporting
    Capabilities: [258] L1 PM Substates
    Capabilities: [128] Power Budgeting <?>
    Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
    Kernel driver in use: nvidia

% COLUMNS=120 dpkg -l | grep nvidia 
ii  nvidia-331-updates       331.38-0ubuntu7.1 amd64             NVIDIA binary driver - version 331.38
ii  nvidia-common            1:0.2.91.7        amd64             transitional package for ubuntu-drivers-common
ii  nvidia-libopencl1-331-up 331.38-0ubuntu7.1 amd64             NVIDIA OpenCL Driver and ICD Loader library
ii  nvidia-prime             0.6.2             amd64             Tools to enable NVIDIA's Prime
ii  nvidia-settings          331.20-0ubuntu8   amd64             Tool for configuring the NVIDIA graphics driver

Information from nvidia-xconfig:
  Operating System: Linux-x86_64
  NVIDIA Driver Version: 331.38

Let me know if further information is needed.

If someone knows the workaround I will be grateful for information.

Best Regards,
Paweł

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-319 in Ubuntu.
https://bugs.launchpad.net/bugs/1263498

Title:
  Asus G75VX, can not modify brightness

Status in “nvidia-graphics-drivers-319” package in Ubuntu:
  Confirmed
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Confirmed

Bug description:
  1. Ubuntu 13.10
  2. N: Unable to locate package nvidia-graphics-drivers-319
  3. I expected that when I changed the brightness level for my laptop monitor that the brightness would also change.
  4. Instead, the brightness always stays at 100%

  I have tried every configuration of grub that I have seen online or
  been asked to try on freenode.net #ubuntu by 3 different people.
  Nothing seems to fix this problem. The file for the brightness is
  always updated but it is like the driver never tells the hardware to
  change the brightness.

  I have tried Tried :
  acpi_backlight=vendor
  pcie_aspm=force
  acpi_osi='!Windows 2012'

  Option "RegistryDwords" "EnableBrightnessControl=1"

  echo 50 > /sys/class/backlight/acpi_video0/brightness
  echo 50 > /sys/class/backlight/acpi_video1/brightness
  echo 50 > /sys/class/backlight/asus/brightness

  nothing seems to work (the files are of course updated but the monitor
  rests at 100% brightness)

  I have also tried the XOrg-server and nvidia-304 drivers. They all
  have the same result, nothing.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: nvidia-319 319.32-0ubuntu7
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  NonfreeKernelModules: wl nvidia
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  Date: Sun Dec 22 16:16:35 2013
  InstallationDate: Installed on 2013-10-27 (55 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  SourcePackage: nvidia-graphics-drivers-319
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.modprobe.d.nvidia.319.hybrid.conf: [deleted]

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