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[Federico Leoni <effelle@xxxxxxxxx>]

A customer of mine gave me his old notebook because he bought a new one.
The laptop is running an p to date Xubuntu 13.10 64bit. Now I'm
suffering similar issue with brightness control: when I press the
appropriate keys on keyboard the slide appears on the upper right corner
of the screen but even if it changes the setting has no effect on the
system . The notebook I have has an Intel X3100 integrated video

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (primary) (rev 0c)

I tried different combinations on grub but no one resolved the issue.
Problem is I have not intel_backlight on /sys/class/backlight folder but
just  acpi_video0 or dell_backlight (if I set acpi_backlight=vendor on
grub).

------------------
effe@Vostro1310:/sys/class/backlight$ for i in /sys/class/backlight/*; do echo -e "\n $i"; cat $i/{brightness,max_brightness,actual_brightness}; done

 /sys/class/backlight/dell_backlight
1
7
1
------------------

If I increase the backlight the files are correctly updated:

------------------
 /sys/class/backlight/dell_backlight
7
7
7
------------------
acpi_listen works just on new mainline kernel 3.13.2 (tried bot generic and lowlatency) on stock kernel there isn't output at all:

video/brightnessup BRTUP 00000086 00000000 K
video/brightnessup BRTUP 00000086 00000000 K
video/brightnessup BRTUP 00000086 00000000 K
video/brightnessdown BRTDN 00000087 00000000 K
video/brightnessdown BRTDN 00000087 00000000 K
video/brightnessdown BRTDN 00000087 00000000 K

Now I'm using xrandr to change the brightness:

effe@Vostro1310:/sys/class/backlight$ xrandr --output LVDS1 --brightness
0.5

What can I try to triage the issue?

Thanks.

-- 
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/1261853

Title:
  8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen
  backlight

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  the change in the level of illumination of the screen, through the
  corresponding option in the control panel, has no effect.

  Upstream post: http://www.spinics.net/lists/linux-acpi/msg48075.html

  WORKAROUND: In Ubuntu kernel only, version 3.11.0-14-generic tested:
  acpi_backlight=vendor

  WORKAROUND: In mainline only:
  video.use_native_backlight=1

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-14-generic 3.11.0-14.21
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alex       1443 F.... pulseaudio
                        alex      11159 F.... pulseaudio
  Date: Tue Dec 17 18:50:13 2013
  HibernationDevice: RESUME=UUID=04335018-6e1d-453d-a8ba-25ae1c34f2eb
  InstallationDate: Installed on 2013-12-14 (2 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. Inspiron 5521
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=it
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic.efi.signed root=UUID=d4cdcfba-0a53-41d0-a9ce-0516d3fab0f0 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-14-generic N/A
   linux-backports-modules-3.11.0-14-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/22/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0K08H3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A06
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd02/22/2013:svnDellInc.:pnInspiron5521:pvrA06:rvnDellInc.:rn0K08H3:rvrA00:cvnDellInc.:ct8:cvrA06:
  dmi.product.name: Inspiron 5521
  dmi.product.version: A06
  dmi.sys.vendor: Dell Inc.

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