Comment 0 for bug 518002

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.

ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 /dev/snd/controlC0: ubuntu 2832 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
 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 --
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 05/07/2009
dmi.bios.vendor: Phoenix
dmi.bios.version: V0.3213 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: Extensa 5635Z
dmi.product.version: Not Applicable
dmi.sys.vendor: Acer