[kernel-unable-to-test-upstream]Backlight control not working in Lenovo Y500

[Sandesh C]

I have done :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor"
in /etc/defaults/grub.cfg and update-grub
still i'm am unable to control the the screen brightness

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-18-generic 3.11.0-18.32
ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
Uname: Linux 3.11.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: sandeshc 1905 F.... pulseaudio
 /dev/snd/controlC0: sandeshc 1905 F.... pulseaudio
 /dev/snd/pcmC0D0p: sandeshc 1905 F...m pulseaudio
Date: Tue Mar 25 11:12:58 2014
HibernationDevice: RESUME=UUID=fc659f72-e4d7-4434-bed8-f0f2ee54da04
InstallationDate: Installed on 2014-02-25 (27 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: LENOVO 20193
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic.efi.signed root=UUID=f357b7eb-d6f6-44ea-82d9-9cb2d64b8825 ro quiet splash thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-18-generic N/A
 linux-backports-modules-3.11.0-18-generic N/A
 linux-firmware 1.116.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/21/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 6BCN44WW(V2.04)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900004WIN8 STD SGL
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Y500
dmi.modalias: dmi:bvnLENOVO:bvr6BCN44WW(V2.04):bd05/21/2013:svnLENOVO:pn20193:pvrLenovoIdeaPadY500:rvnLENOVO:rnINVALID:rvr31900004WIN8STDSGL:cvnLENOVO:ct10:cvrLenovoIdeaPadY500:
dmi.product.name: 20193
dmi.product.version: Lenovo IdeaPad Y500
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.14 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14-rc8-trusty/

[Sandesh C (sandeshc13)]

I am unable to test it . This is since I have incurred a problem , when I boot up the mainline kernel , I tried it with both v3.14-rc8-trusty and v3.15-rc2-trusty , there was no GUI , only command line (but I didnt boot it via recovery mode) . I am unable to understand how I should test it.

[Sandesh C (sandeshc13)]

Solved , when update to Ubuntu 14.04 with 3.13 kernel

[penalvch (penalvch)]

Sandesh C, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1297095/comments/7 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 to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.