[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1388636
Title:
[Lenovo V570 Notebook] Brightness not changing via UI widget in GNOME
shell or hotkeys
Status in linux package in Ubuntu:
Expired
Bug description:
Fresh install of a Vivid Vervet Ubuntu GNOME daily iso.
Adding debugging information from
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
I found that
echo 8 > /sys/class/backlight/intel_backlight/brightness
worked to lower my screen brightness, without playing with kernel
parameters.
Booting with the kernel parameter: acpi_backlight=vendor did not
enable the UI widget or hotkeys, although echo 8 >
/sys/class/backlight/intel_backlight/brightness continued to work.
Booting with the kernel parameter: video.use_bios_initial_backlight=0
did not allow for hotkey or widget changes of brightness.
Booting with the kernel parameter: video.use_native_backlight=1 also
did not resolve the issue.
Creating /usr/share/X11/xorg.conf.d/80-backlight.conf
with the contents:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that
works here
BusID "PCI:0:2:0"
EndSection
and rebooting does resolve the issue.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.16.0-24-generic 3.16.0-24.32 [modified:
boot/vmlinuz-3.16.0-24-generic]
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu9
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: asif 2318 F.... pulseaudio
CurrentDesktop: GNOME
Date: Sun Nov 2 15:48:05 2014
HibernationDevice: RESUME=UUID=53025272-1910-418a-9f4a-b6ac00a768f1
InstallationDate: Installed on 2014-11-01 (1 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Alpha amd64 (20141031)
MachineType: LENOVO 1066A9U
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic
root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.16.0-24-generic N/A
linux-backports-modules-3.16.0-24-generic N/A
linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 44CN36WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Emerald Lake
dmi.board.vendor: LENOVO
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnLENOVO:bvr44CN36WW:bd07/11/2011:svnLENOVO:pn1066A9U:pvrLenovoV570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
dmi.product.name: 1066A9U
dmi.product.version: Lenovo V570
dmi.sys.vendor: LENOVO
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