kernel-packages team mailing list archive

[RK <1392016@xxxxxxxxxxxxxxxxxx>]

Hi Christopher,
thanks for your continued help.

The command
"echo 8 > /sys/class/backlight/intel_backlight/brightness"
does set the brightness to a very low value (basically completely black). This was done with the "acpi_backlight=vendor" kernel parameter in use.

Rebooting "with just kernel parameter
video.use_bios_initial_backlight=0" does not change anything (indicator
bubble pops up, backlight level doesn't actually change).

Rebooting "with just kernel parameter video.use_native_backlight=1"
does not change anything (indicator bubble pops up, backlight level
doesn't actually change).


This did work: "Creating a new file in /usr/share/X11/xorg.conf.d/80-backlight.conf and pasting into it the following code:

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "AccelMethod"     "sna"
    Option      "Backlight"       "intel_backlight" # use your backlight that works here
    BusID  "PCI:0:2:0"
EndSection
"
The backlight control now works properly (indicator bubble and proper backlight change). Furthermore, it is now possible to turn off the touchpad by using the function key (the indicator bubble does show up).

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1392016

Title:
  [Asus UL30VT] Backlight control does not work

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The backlight control on my Asus UL30VT has not worked for quite a
  while. It used to work, a few ubuntu versions ago. The backlight
  control bubble does show up when the function keys on the laptop are
  pressed.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lina       2081 F.... pulseaudio
   /dev/snd/controlC0:  lina       2081 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Nov 12 20:20:31 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=c8002bb0-2b05-4952-bc8b-bfcd29ac6117
  InstallationDate: Installed on 2013-02-26 (623 days ago)
  InstallationMedia: This
  MachineType: ASUSTeK Computer Inc. UL30VT
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=ff44dc17-e11a-4d44-8ab6-bf188f64ed83 ro quiet splash acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-07-20 (115 days ago)
  dmi.bios.date: 07/14/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UL30VT
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr211:bd07/14/2010:svnASUSTeKComputerInc.:pnUL30VT:pvr1.0:rvnASUSTeKComputerInc.:rnUL30VT:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: UL30VT
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1392016/+subscriptions