Hi,
Brightness controls work on Ubuntu 12.04 with the raring ringtail kernel
3.8 and the liquorix kernel. 3.12.6. But for the system to launch with
the brightness on, the user has to edit /etc/default/grub and change
this line like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
On Ubuntu 13.10, the brightness controls do not work with these kernel
versions. Changing GRUB_CMDLINE_LINUX_DEFAULT also doesn't work.
- kernel 3.11 (the default one)
- kernel 3.12.6 (installed with these instructions)
- kernel 3.12.6 liquorix
Also, /sys/class/backlight is empty on 13.10, while on 12.0.4.3 it has
two folders "acpi_video0" and "intel_backlight"
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1258058
Title:
10de:0fe4 [Lenovo IdeaPad Y510P] Brightness control no effect on
screen
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Brightness control no effect on screen, I managed to get control over
brightness by using xbacklight.
My issue (laptop and everything else) is exactly the same as this one
http://ubuntuforums.org/showthread.php?t=2167180
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-14-generic 3.11.0-14.21
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: radenkovich 2284 F.... pulseaudio
/dev/snd/controlC0: radenkovich 2284 F.... pulseaudio
Date: Thu Dec 5 09:45:30 2013
HibernationDevice: RESUME=UUID=ea9a6ac1-13ea-4060-9ef9-60a3309bd921
InstallationDate: Installed on 2013-11-11 (23 days ago)
InstallationMedia: This
MachineType: LENOVO 20217
MarkForUpload: True
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic.efi.signed
root=UUID=aec56d0c-f753-4e40-948a-34e69d7dfca6 ro "acpi_osi=!Windows 2012"
RelatedPackageVersions:
linux-restricted-modules-3.11.0-14-generic N/A
linux-backports-modules-3.11.0-14-generic N/A
linux-firmware 1.116
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/22/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 74CN41WW(V2.07)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: VIQY0Y1
dmi.board.vendor: LENOVO
dmi.board.version: 31900004STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Y510P
dmi.modalias:
dmi:bvnLENOVO:bvr74CN41WW(V2.07):bd08/22/2013:svnLENOVO:pn20217:pvrLenovoIdeaPadY510P:rvnLENOVO:rnVIQY0Y1:rvr31900004STD:cvnLENOVO:ct10:cvrLenovoIdeaPadY510P:
dmi.product.name: 20217
dmi.product.version: Lenovo IdeaPad Y510P
dmi.sys.vendor: LENOVO
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