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Message #114931
[Bug 1402365] Re: Backlight Bug
Kamalakar Agashe, this bug report is being closed due to your last
comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402365/comments/12
regarding this being fixed with an update. For future reference you can
manage the status of your own bugs by clicking on the current status in
the yellow line and then choosing a new status in the revealed drop down
box. You can learn more about bug statuses at
https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time
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future bugs you may find.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1402365
Title:
Backlight Bug
Status in linux package in Ubuntu:
Invalid
Bug description:
Backlight control does not work, but there are entries in
/sys/class/backlight.
ls /sys/class/backlight > backlight
grep -r . /proc/acpi > acpi
sudo acpidump -o acpidump.txt
acpixtract acpidump.txt
iasl -d DSDT.dat
sudo fwts > fwts
sudo fwts method > fwts_method
dmesg | grep 'ACPI: Video' > video
sudo dmidecode > dmidecode.log
cat /proc/version > version
Testing for a work around
Reboot with only the kernel parameter acpi_backlight=vendor
does not work
ls /sys/class/backlight > vendorbacklight
No such folder /sys/class/backlight/intel_backlight/
Reboot with just kernel parameter video.use_bios_initial_backlight=0
does not work
reboot with just kernel parameter video.use_native_backlight=1
does not work
WORKAROUND: Install fglrx.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-43-generic 3.13.0-43.72
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: vidya 1832 F.... pulseaudio
/dev/snd/controlC0: vidya 1832 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Dec 14 16:16:27 2014
HibernationDevice: RESUME=UUID=42b35770-926b-43cf-8874-b5452e26b5e5
InstallationDate: Installed on 2014-12-13 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: LENOVO 80E3
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed root=UUID=7eccd389-f558-421b-928a-541b3f1c16f0 ro quiet splash vt.handoff=7 video.use_native_backlight=1
RelatedPackageVersions:
linux-restricted-modules-3.13.0-43-generic N/A
linux-backports-modules-3.13.0-43-generic N/A
linux-firmware 1.127.10
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/26/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: A2CN25WW(V1.07)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lancer 5B2
dmi.board.vendor: LENOVO
dmi.board.version: SDK0F82990 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo G50-45
dmi.modalias: dmi:bvnLENOVO:bvrA2CN25WW(V1.07):bd08/26/2014:svnLENOVO:pn80E3:pvrLenovoG50-45:rvnLENOVO:rnLancer5B2:rvrSDK0F82990WIN:cvnLENOVO:ct10:cvrLenovoG50-45:
dmi.product.name: 80E3
dmi.product.version: Lenovo G50-45
dmi.sys.vendor: LENOVO
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References