[Bug 734617] Re: [Maverick Meerkat] Can't adjust brightness in VAIO VPCCW15FL

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: acpi-support (Ubuntu)
       Status: New => Confirmed

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Title:
  [Maverick Meerkat] Can't adjust brightness in VAIO VPCCW15FL

Status in “acpi-support” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: acpi-support

  I have Ubuntu 10.10 installed in a Sony VAIO CW15 (VPCCW15FL) with
  privative  NVidia drivers  260.19.36 downloaded from Nvidia.com.
  Compiz and animations work perfectly.

  When Fn+brightness keys are pressed (Fn+F5, Fn+F6) Ubuntu shows up the
  graphic sliders meaning that brightness has been increased or
  decreased, but actually the brightness it is NOT modified at all,
  keeping it at maximum.

  The nvidia driver has been set correctly in    /etc/X11/xorg.conf. I
  can use the  NVIDIA X Server Settings correctly.

  I have the next files:

  *     /proc/acpi/video/NGFX/LCD/brightness     with the line:
                <not supported>

        Same for   /proc/acpi/video/NGFX/HDMI/brightness    and
  /proc/acpi/video/NGFX/CRT/brightness.

  *     Files on      /usr/share/acpi-support    making reference to
  some files of     /var/lib/acpi-support. But this last path has NO
  files, neither hidden.

  *     The next files on       /sys/class/backlight/sony
                
                + power           [ folder ]
                + subsystem    [ link to one folder back: /sys/class/backlight/ ]
                + actual_brightness
                + bl_power
                + brightness
                + max_brigthness
                + uevent (empty file)

       with the 'brightness' and 'actual_brightness' files getting
  modified when pressing Fn+F5  or  Fn+F6 keys.

  *     /var/log/Xorg.0.log     (attached)   with this special lines:

                [    37.529] (WW) NVIDIA(0): ACPI: Error: Unable to find the brightness file path under
                [    37.529] (WW) NVIDIA(0):     /proc/acpi/video. The NVIDIA X driver will not be able to
                [    37.529] (WW) NVIDIA(0):     respond to ACPI brightness change hotkey events.

  *    Output of `dmesg' command (attached in case it could be useful)

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xorg 1:7.5+6ubuntu3
  ProcVersionSignature: Ubuntu 2.6.35-25.44-generic-pae 2.6.35.10
  Uname: Linux 2.6.35-25-generic-pae i686
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86 Kernel Module  260.19.36  Tue Jan 18 17:10:40 PST 2011
   GCC version:  gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
  Architecture: i386
  Date: Sun Mar 13 19:35:10 2011
  DkmsStatus:
   vboxhost, 4.0.4, 2.6.35-25-generic-tuxonice, i686: built 
   vboxhost, 4.0.4, 2.6.35-25-generic-pae, i686: installed 
   vboxhost, 4.0.4, 2.6.35-27-generic-pae, i686: built
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: Sony Corporation VPCCW15FL
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-25-generic-pae root=UUID=717c9552-edd1-4682-a12e-2079273ff453 ro acpi_osi=Linux quiet splash
  ProcEnviron:
   LANG=es_MX.utf8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  dmi.bios.date: 09/22/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: R0190Y5
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR0190Y5:bd09/22/2009:svnSonyCorporation:pnVPCCW15FL:pvrC602QRN2:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: VPCCW15FL
  dmi.product.version: C602QRN2
  dmi.sys.vendor: Sony Corporation
  system:
   distro:             Ubuntu
   codename:           maverick
   architecture:       i686
   kernel:             2.6.35-25-generic-pae

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