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[Max Oropeza <moropeza28@xxxxxxxxx>]

Sorry about the lateness, school just started ad I'm kinda busy now. I 
did what you said and it was working if I used high numbers like 200.  
Also it is booting with this
> acpi_osi=Linux acpi_backlight=vendor
because that's the only way I've made the light go down.


On 08/25/2013 06:40 PM, Aaron Lu wrote:
> +Lee, the acer maintainer and sorry for the late reply.
>
> On 08/14/2013 12:14 PM, Maximiliano Oropeza wrote:
>> Ok, now there was a change. In *acer-wmi*, I put:
>>> root@Dayman:/home/maxo# cd /sys/class/backlight/
>>> root@Dayman:/sys/class/backlight# cd /sys/class/backlight/acer-wmi
>>> root@Dayman:/sys/class/backlight/acer-wmi# cat max_brightness
>>> 15
>>> root@Dayman:/sys/class/backlight/acer-wmi# 10
>>> 10: command not found
>>> root@Dayman:/sys/class/backlight/acer-wmi# echo 5 > brightness
>>> root@Dayman:/sys/class/backlight/acer-wmi# echo 7 > brightness
>> and there was no change at all.
>>
>> But when I went to *intel_backlight*, I got:
>>> root@Dayman:/sys/class/backlight/acer-wmi# cd
>>> /sys/class/backlight/intel_backlight
>>> root@Dayman:/sys/class/backlight/intel_backlight# cat max_brightness
>>> 976
>>> root@Dayman:/sys/class/backlight/intel_backlight# echo 5 > brightness
>>> root@Dayman:/sys/class/backlight/intel_backlight# echo 7 > brightness
>>> root@Dayman:/sys/class/backlight/intel_backlight#
>> and when I put echo 5 > brightness, the screen went super low, the same
> The intel_backlight's max_brightness could be very high so the value 5
> or 7 are almost identical to 0, you can try some larger values like 500
> or 2000 etc.
>
>> with echo 7. I tried changing the brightness using the FN keys and it
>> went at full brightness and once again I can't lower the brightness to
>> about half. Same problems as before but *intel_backlight* is the one
>> that actually changed brightness.
> Your system needs some quirk I suppose. BTW, your system only have two
> backlight interfaces acer-mi and intel_backlight, is it booting with
> acpi_backlight=vendor option?
>
> Thanks,
> Aaron

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1173961

Title:
  [Gateway NV55C] Two backlight interfaces that wont adjust backlight.

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I couldn't get the backlight to work after I upgraded to 13.04.

  WORKAROUND: The only grub lines that seem to work are these:
  GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
  GRUB_CMDLINE_LINUX="acpi_osi="

  I tried changing the grub parameters, and after several trys, nothing.
  I was asked to run     grep . /sys/class/backlight/*/* and got the
  results of:

  maxo@Dayman:~$ grep . /sys/class/backlight/*/*
  /sys/class/backlight/acpi_video0/actual_brightness:9
  /sys/class/backlight/acpi_video0/bl_power:0
  /sys/class/backlight/acpi_video0/brightness:9
  grep: /sys/class/backlight/acpi_video0/device: Is a directory
  /sys/class/backlight/acpi_video0/max_brightness:9
  grep: /sys/class/backlight/acpi_video0/power: Is a directory
  grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
  /sys/class/backlight/acpi_video0/type:firmware
  /sys/class/backlight/intel_backlight/actual_brightness:976
  /sys/class/backlight/intel_backlight/bl_power:0
  /sys/class/backlight/intel_backlight/brightness:976
  grep: /sys/class/backlight/intel_backlight/device: Is a directory
  /sys/class/backlight/intel_backlight/max_brightness:976
  grep: /sys/class/backlight/intel_backlight/power: Is a directory
  grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
  /sys/class/backlight/intel_backlight/type:raw

  But using the Fn Keys, you can only adjust it a little, like from full
  brightness to about half. To add something else, with the other
  parameters when I adjust with the Fn Keys, the brightness bubble you
  get on the top right of your screen doesn't appear.

  http://marc.info/?l=linux-acpi&m=137557874107551&w=2

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified: boot/vmlinuz-3.8.0-19-generic]
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  maxo       2482 F.... pulseaudio
  Date: Sun Apr 28 07:01:21 2013
  HibernationDevice: RESUME=UUID=f71ed279-badf-446b-afc6-d5a75316ec0a
  InstallationDate: Installed on 2013-04-25 (2 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Gateway NV55C
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=bc22ba4b-fcd9-46f3-b10a-11477dd4f618 ro acpi_osi= acpi_backlight=vendor quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/10/2011
  dmi.bios.vendor: Gateway
  dmi.bios.version: V1.24
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: NV55C
  dmi.board.vendor: Gateway
  dmi.board.version: V1.24
  dmi.chassis.type: 10
  dmi.chassis.vendor: Gateway
  dmi.chassis.version: V1.24
  dmi.modalias: dmi:bvnGateway:bvrV1.24:bd08/10/2011:svnGateway:pnNV55C:pvrV1.24:rvnGateway:rnNV55C:rvrV1.24:cvnGateway:ct10:cvrV1.24:
  dmi.product.name: NV55C
  dmi.product.version: V1.24
  dmi.sys.vendor: Gateway

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