"acpi_backlight=vendor" needs to be present in kernel cmdline to have backlight working
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
On my laptop I had to add "acpi_backlight
If I remove that argument then /sys/class/
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-
ProcVersionSign
Uname: Linux 2.6.39-1-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfe9f4000 irq 46'
Mixer name : 'Intel Cantiga HDMI'
Components : 'HDA:10ec0269,
Controls : 15
Simple ctrls : 8
Date: Tue May 10 18:26:48 2011
HibernationDevice: RESUME=
MachineType: ASUSTeK Computer Inc. UL30A
ProcEnviron:
SHELL=/bin/bash
LANG=pl_PL.UTF-8
LANGUAGE=pl_PL:en
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.52
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/28/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 212
dmi.board.
dmi.board.name: UL30A
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: UL30A
dmi.product.
dmi.sys.vendor: ASUSTeK Computer Inc.
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
status: | Confirmed → Incomplete |
Changed in linux (Ubuntu): | |
status: | Incomplete → Fix Committed |
@Marcin-
You may wish to try my 'linux- kamal-mjgbackli ght' PPA: /launchpad. net/~kamalmosta fa/+archive/ linux-kamal- mjgbacklight backlight/ intel_backlight (backported bits from 2.6.39 plus an additional yet-to- land-upstream patch). The patched kernel forces "acpi_backlight =vendor" internally (i.e. it disables acpi_video0). I'm hoping that these patches will all land in Oneiric.
https:/
It provides:
1. A patched kernel which supplies a new /sys/class/
2. A patched gnome-power-manager which connects the brightness keys to the new intel_backlight interface.
See also bug LP: #568611, where other users of this PPA have logged their findings.