It looks like this has been fixed upstream. I will close it. If the
problem still occurs, please reopen it.
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1138168
Title:
8086:0106 Backlight control regression
Status in Linux:
Incomplete
Status in linux package in Ubuntu:
Invalid
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/backlight/acpi_video0/brightness under any tested scenario.
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=vendor. I had the exact
same results as when i did the test earlier in raring and quantal (see PDF file
in attachment). The attachment contains the following files (all system
generated files are from this install)
Detailed test.pdf
dmesg_3.6.11-030611-generic
dmesg_3.7.10-030710-generic
dmesg_3.8.0-8-generic
dmesg_3.8.1-030801-generic
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/backlight/intel_backlight/brightness
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-8-generic 3.8.0-8.17
ProcVersionSignature: Ubuntu 3.8.0-8.17-generic 3.8.0
Uname: Linux 3.8.0-8-generic x86_64
ApportVersion: 2.9-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: chad 1708 F.... xfce4-volumed
chad 1722 F.... pulseaudio
/dev/snd/pcmC0D0p: chad 1722 F...m pulseaudio
CurrentDmesg:
Date: Fri Mar 1 11:31:52 2013
HibernationDevice: RESUME=UUID=a974f07b-dcae-4886-8ddb-e5a48219f891
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=/boot/vmlinuz-3.8.0-8-generic
root=UUID=5c6a915b-d2e5-4746-9c09-657e51145ad6 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-8-generic N/A
linux-backports-modules-3.8.0-8-generic N/A
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.asset.tag: ATN12345678901234567
dmi.board.name: K54C
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrK54C.210:bd10/23/2012:svnASUSTeKComputerInc.:pnK54C:pvr1.0:rvnASUSTeKComputerInc.:rnK54C:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: K54C
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
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