8086:0106 Backlight control regression
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Incomplete
|
Medium
|
|||
linux (Ubuntu) |
Triaged
|
Medium
|
Unassigned |
Bug Description
Laptop: ASUS A54C-NB91 with BIOS version 210 After the 3.6 kernel controlling the backlight via software (like xbacklight and the brightness applet) no longer works as intended (attempting to get brightness alters the brightness). This was not a Issue on the older BIOS version (207), but downgrading that is not possible, and ASUS will not fix it stating the typical we don't support linux on this model On the 3.6 kernel with the latest BIOS the backlight can't be controlled via the fn+brightness keys, that still works on the 3.7 kernel and up i have never had the fn+brightness keys ever update /sys/class/
I have tested Kernel versions 3.8.1-030801, 3.8.0-8, 3.7.10-030710, and 3.6.11-030611 today on raring without acpi_backlight=
Detailed test.pdf
dmesg_3.
dmesg_3.
dmesg_3.
dmesg_3.
lspci_very_verbose
syslog
WORKAROUND: One may choose a value from 0 (completely off) to 4882 (100%) works in increments of 2:
echo 100 | sudo tee /sys/class/
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-
ProcVersionSign
Uname: Linux 3.8.0-8-generic x86_64
ApportVersion: 2.9-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC0D0p: chad 1722 F...m pulseaudio
CurrentDmesg:
Date: Fri Mar 1 11:31:52 2013
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-03-01 (0 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130301)
MachineType: ASUSTeK Computer Inc. K54C
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.103
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/23/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: K54C.210
dmi.board.
dmi.board.name: K54C
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: K54C
dmi.product.
dmi.sys.vendor: ASUSTeK Computer Inc.
tags: | added: kernel-bug-exists-upstream |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in linux: | |
status: | Confirmed → Incomplete |
tags: |
added: latest-bios-210 regression-release removed: regression |
description: | updated |
summary: |
- Backlight control regression + 8086:0106 Backlight control regression |
tags: | removed: backlight kernel |
This change was made by a bot.