Both brightness and sound keys are working fine with fn on 10.10 for me.Hope
your one will get fix soon.

On Tue, Oct 12, 2010 at 2:41 AM, C Pirnat <email address hidden> wrote:

> I can confirm this bug still exists in 10.10 with my acer aspire 7736z
> which has the same video card. I tried the first workaround passing
> arguments to the kernel through grub which fixes the issue.
>
> --
> lucid extensa 5635z backlight dimming not working at all
> https://bugs.launchpad.net/bugs/518002
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux” package in Ubuntu: Triaged
>
> Bug description:
> [Workaround 1]
> For Acer Extensa 5635Z with bios version V0.3219 or newer adding
> acpi_osi=Linux acpi_backlight=legacy as boot parameter resolves the issue.
>
> [Workaround 2]
> See comment #28.
>
> [Report]
> ubuntu lucid-desktop-amd64 20100206 (booting the iso from hd via grub2
> loopback) on acer extensa 5635z:
> the backlight settings are simply ignored. the keys work, the notification
> works (changing according to the key presses), but the display always stays
> at the same full brightness.
>
> boot with acpi=off:
> backlight dimming works. 10 levels are available. surprisingly there is no
> notification. (notification for sound is there)
> warning: a short press of the power button kills the power immediately!
>
> ProblemType: Bug
> 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: CONEXANT Analog [CONEXANT Analog]
>    Subdevices: 1/1
>    Subdevice #0: subdevice #0
> AudioDevicesInUse:
>  USER        PID ACCESS COMMAND
>  /dev/snd/controlC0:  ubuntu     2832 F.... pulseaudio
> CRDA: Error: [Errno 2] No such file or directory
> Card0.Amixer.info:
>  Card hw:0 'Intel'/'HDA Intel at 0xf0700000 irq 22'
>    Mixer name   : 'Conexant CX20561 (Hermosa)'
>    Components   : 'HDA:14f15051,10250253,00100000'
>    Controls      : 14
>    Simple ctrls  : 7
> Date: Sat Feb  6 11:04:34 2010
> DistroRelease: Ubuntu 10.04
> LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100206)
> MachineType: Acer Extensa 5635Z
> Package: linux-image-2.6.32-12-generic 2.6.32-12.17
> ProcCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz boot=casper
> iso-scan/filename=/boot/iso/hostname/lucid-desktop-amd64.iso noprompt --
> ProcEnviron:
>  LANG=en_US.UTF-8
>  SHELL=/bin/bash
> ProcVersionSignature: Ubuntu 2.6.32-12.17-generic
> Regression: No
> RelatedPackageVersions: linux-firmware 1.29
> Reproducible: Yes
> SourcePackage: linux
> TestedUpstream: No
> Uname: Linux 2.6.32-12-generic x86_64
> dmi.bios.date: 05/07/2009
> dmi.bios.vendor: Phoenix
> dmi.bios.version: V0.3213
> dmi.board.name: BA50-MV
> dmi.board.vendor: Acer
> dmi.board.version: Not Applicable
> dmi.chassis.type: 10
> dmi.chassis.vendor: Acer
> dmi.chassis.version: N/A
> dmi.modalias:
> dmi:bvnPhoenix:bvrV0.3213:bd05/07/2009:svnAcer:pnExtensa5635Z:pvrNotApplicable:rvnAcer:rnBA50-MV:rvrNotApplicable:cvnAcer:ct10:cvrN/A:
> dmi.product.name: Extensa 5635Z
> dmi.product.version: Not Applicable
> dmi.sys.vendor: Acer
>
>
>
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>