Changes to screen brightness delayed

[Christopher Barrington-Leigh]

This has changed (during a recent update?) but under 14.04 my hotkeys for changing the screen brightness no longer work immeidately. Their effect is now delayed by about 10 seconds. there is no hangup to the user interface during that time.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-40-generic 3.13.0-40.69
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: cpbl 3437 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Dec 5 13:18:46 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-11-14 (20 days ago)
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
MachineType: LENOVO 34372VU
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic root=UUID=92076c43-2780-4000-8d3d-5d7bdbb54643 ro acpi=noirq quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-40-generic N/A
 linux-backports-modules-3.13.0-40-generic N/A
 linux-firmware 1.127.10
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-11-15 (19 days ago)
dmi.bios.date: 05/28/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GCET99WW (2.59 )
dmi.board.asset.tag: Not Available
dmi.board.name: 34372VU
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrGCET99WW(2.59):bd05/28/2014:svnLENOVO:pn34372VU:pvrThinkPadX230Tablet:rvnLENOVO:rn34372VU:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 34372VU
dmi.product.version: ThinkPad X230 Tablet
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 v3.18 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/v3.18-rc7-vivid/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]