Closing this bug with Won't fix as this kernel / release is no longer supported.
Please feel free to open a new bug report if you're still experiencing this on
a newer release (Bionic 18.04.3 / Disco 19.04)
Thanks!
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Changed in: linux (Ubuntu)
Status: Invalid => Won't Fix
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https://bugs.launchpad.net/bugs/518002
Title:
extensa 5635z backlight dimming not working. works with setpci.
Status in linux package in Ubuntu:
Won't Fix
Bug description:
[Status]
Fix for Natty and Maverick exists in
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight .
Happens on Maverick. Tested with 2.6.36 and 2.6.38 (see comment #37) kernel.
Tested with 2.6.39rc.
Happens on Lucid.
[Workaround/Fix 0]
Install the patched kernel and gnome-power-manager from
https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight by adding
that ppa to your sources and upgrading your system (for maverick and natty).
[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]
Write into the "Legacy Backlight Brightness" register (on [8086:2a42]
hardware):
first make sure you have that hardware ([8086:2a42]) at that address
(00:02.0) by looking at the output of lspci -nn|grep VGA
then try setpci -s 00:02.0 F4.B=a1
(a1 in the above line is just one example for a brightness value; you can use
any two digit hexadecimal value, e.g:
80 for something like half brightness
ff for full
better avoid 00 or be prepared for pitch black)
Also see comments #28 and #32.
And be careful where you point that setpci command. It might even damage your
hardware.
[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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