kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Thindi, as per http://us.acer.com/ac/en/US/content/drivers an update is available for your BIOS (3310). If you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it doesn't, could you please both specify what happened, and just provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Thank you for your understanding.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1258495

Title:
  8086:27ae [Acer AOA110] backlight too bright, can't dim it much

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Screen is far too bright, dims only slightly with hotkeys, brightness
  control applet ineffective. Tried more than half a dozen solutions
  (incl. editing the grub which used to work fine with Ubuntu 12.04) but
  none of them worked.

  thindi@thindi-AOA110:~$ ls /sys/class/backlight > backlight
  thindi@thindi-AOA110:~$ grep -r . /proc/acpi > acpi
  grep: /proc/acpi/event: Permission denied
  thindi@thindi-AOA110:~$ sudo acpidump -o acpidump.txt
  thindi@thindi-AOA110:~$ acpixtract acpidump.txt
  Acpi table [DSDT] -  24038 bytes written to DSDT.dat
  Acpi table [SSDT] -   1220 bytes written to SSDT.dat
  thindi@thindi-AOA110:~$ iasl -d DSDT.dat

  Intel ACPI Component Architecture
  AML Disassembler version 20100528 [Dec 19 2012]
  Copyright (c) 2000 - 2010 Intel Corporation
  Supports ACPI Specification Revision 4.0a

  Loading Acpi table from file DSDT.dat
  Acpi table [DSDT] successfully installed and loaded
  Pass 1 parse of [DSDT]
  Pass 2 parse of [DSDT]
  Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
  ...................................................................................................................................................................................................................................................................................................................................................................
  Parsing completed
  Disassembly completed, written to "DSDT.dsl"
  sudo fwts > fwts
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258495/+attachment/3931116/+files/fwts

  thindi@thindi-AOA110:~$ dmesg | grep 'ACPI: Video' > video
  thindi@thindi-AOA110:~$ sudo dmidecode > dmidecode.log
  thindi@thindi-AOA110:~$ cat /proc/version > version

  Reboot with only the kernel parameter acpi_backlight=vendor:
  If that means the grub file (excerpt)  should look like this:
  GRUB_DEFAULT=0
  GRUB_HIDDEN_TIMEOUT=0
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=10
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
  GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
  GRUB_CMDLINE_LINUX=""

  Make a comment on if you can now alter the backlight with hotkeys or a brightness applet.
  Neither do the job.

  thindi@thindi-AOA110:~$ ls /sys/class/backlight > vendorbacklight
  thindi@thindi-AOA110:~$ sudo su
  root@thindi-AOA110:/home/thindi# ls -la /sys/class/backlight/intel_backlight/ > lslabacklight
  root@thindi-AOA110:/home/thindi# echo 8 > /sys/class/backlight/intel_backlight/brightness
  No change after doing that.

  o "Reboot with kernel parameter video.use_bios_initial_backlight=0"

  Don't know how to do that.

  Dealing with the rest on this site
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight is out of my depth.

  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 i686
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  thindi     1586 F.... pulseaudio
   /dev/snd/pcmC0D0p:   thindi     1586 F...m pulseaudio
  Date: Fri Dec  6 11:31:38 2013
  HibernationDevice: RESUME=UUID=9793476b-8516-4e8d-b628-0dd0389b1376
  InstallationDate: Installed on 2013-12-03 (3 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MachineType: Acer AOA110
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic root=UUID=bf6adaec-4e58-4748-95d7-8d287f559046 ro quiet splash pcie_aspm=force acpi_backlight=vendor 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
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/06/2008
  dmi.bios.vendor: Acer
  dmi.bios.version: v0.3309
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 1
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAcer:bvrv0.3309:bd10/06/2008:svnAcer:pnAOA110:pvr1:rvnAcer:rn:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
  dmi.product.name: AOA110
  dmi.product.version: 1
  dmi.sys.vendor: Acer

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