Comment 62 for bug 573984

screen brightness can be adjusted since Linux kernel 3
seems kamals changes made it into the main kernel

--
Tony Diep | 416 537 2225

On Oct 25, 2011, at 12:05 AM, Idonmez-l <email address hidden> wrote:

> Does booting with the
>
> acpi_backlight=vendor
>
> grub option makes any difference?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/573984
>
> Title:
> Screen brightness can not be adjusted in Lucid with Intel Arrandale
> graphics
>
> Status in “linux” package in Ubuntu:
> Confirmed
> Status in openSUSE:
> Incomplete
>
> Bug description:
> PROBLEM
> Hot keys for adjusting screen brightness do not work in Karmic or Lucid for Gateway NV59 laptop with Arrandale Graphics.
> Under Karmic, workaround was to adjust screen brightness while still in BIOS post.
> Karmic would boot with the selected screen brightness
>
> Under Lucid, screen brightness goes to 100% when booting, ignoring brightness set during boot.
> Hot keys for adjusting brightness do not work.
>
> RESULTS
> Tried the following:
>
> * Setting memory directly under /proc
> Results: memory for VGA brightness would change but display wouldn't actually change
>
> CHANGING BOOT PARAMETERS:
>
> # GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nolapic acpi_backlight=vendor"
> # above line doesn't solve problem
> # GRUB_CMDLINE_LINUX="acpi=off"
> # above line allows screen brightness but hyperthreading is off
> GRUB_CMDLINE_LINUX="acpi=ht"
> # above line allows screen brightness adjustment at cost of power, core temp?
> # GRUB_CMDLINE_LINUX="acpi_generic_hotkey"
> # above line doesn't solve screen brightness problem
> # GRUB_CMDLINE_LINUX="acpi=strict"
> # above line does not solve screen brightness problem
> # GRUB_CMDLINE_LINUX="acpi_osi=Linux"
> # above line does not solve screen brightness problem
> # GRUB_CMDLINE_LINUX="acpi=noirq"
> # above line doesn't solve
> # GRUB_CMDLINE_LINUX="acpi=noacpi"
> # above line does not allow screen brightness adjustment
> # GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
> # above line does not work
> # GRUB_CMDLINE_LINUX="i915.modeset=0"
> # above line make linux unbootable. Have to book off USB/CD and manually edit grub.conf
>
> BEST WORKAROUND
> GRUB_CMDLINE_LINUX="acpi=ht"
> # above line allows screen brightness adjustment at cost of power, core temp?
>
> Linux tdlap6 2.6.32-21-generic #32-Ubuntu SMP Fri Apr 16 08:09:38 UTC
> 2010 x86_64 GNU/Linux
>
> ProblemType: Bug
> DistroRelease: Ubuntu 10.04
> Package: linux-image-2.6.32-21-generic 2.6.32-21.32
> Regression: Yes
> Reproducible: Yes
> ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
> Uname: Linux 2.6.32-21-generic x86_64
> AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
> Architecture: amd64
> ArecordDevices:
> **** List of CAPTURE Hardware Devices ****
> card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: tonydiep 1621 F.... pulseaudio
> CRDA: Error: [Errno 2] No such file or directory
> Card0.Amixer.info:
> Card hw:0 'Intel'/'HDA Intel at 0xf0800000 irq 22'
> Mixer name : 'Intel G45 DEVIBX'
> Components : 'HDA:10ec0272,1025033d,00100001 HDA:14f12c06,10250093,00100000 HDA:80862804,80860101,00100000'
> Controls : 26
> Simple ctrls : 13
> Date: Sun May 2 16:39:17 2010
> HibernationDevice: RESUME=/dev/sda5
> InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
> MachineType: Gateway NV59
> ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=53103199-f27c-4ef8-879c-bf122b4216fe ro acpi=ht quiet splash
> ProcEnviron:
> LANG=en_CA.utf8
> SHELL=/bin/bash
> RelatedPackageVersions: linux-firmware 1.34
> RfKill:
> 0: phy0: Wireless LAN
> Soft blocked: no
> Hard blocked: no
> SourcePackage: linux
> dmi.bios.date: 11/26/2009
> dmi.bios.vendor: Phoenix Technologies LTD
> dmi.bios.version: V1.09
> dmi.board.name: NV59
> dmi.board.vendor: Gateway
> dmi.board.version: Rev
> dmi.chassis.asset.tag: No Asset Tag
> dmi.chassis.type: 10
> dmi.chassis.vendor: Gateway
> dmi.chassis.version: Rev
> dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.09:bd11/26/2009:svnGateway:pnNV59:pvrRev:rvnGateway:rnNV59:rvrRev:cvnGateway:ct10:cvrRev:
> dmi.product.name: NV59
> dmi.product.version: Rev
> dmi.sys.vendor: Gateway
>
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