Public bug reported:
Sometimes, the screen brightness controls work on my laptop, and
sometimes they don't. I haven't noticed any pattern as to when it works
or doesn't.
When it doesn't work, I press Fn+F6/F7 to adjust the screen brightness.
The notification pop-up appears, showing the new brightness setting --
but the brightness doesn't actually change. Rebooting fixes the issue.
There is nothing in syslog or dmesg.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.47
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mike 4459 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue May 20 09:55:01 2014
HibernationDevice: RESUME=UUID=f989c947-43a9-46bf-9966-d1defa7837e3
InstallationDate: Installed on 2013-01-12 (492 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: TOSHIBA TECRA R700
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic
root=/dev/mapper/ubuntu-root ro quiet splash crashkernel=384M-:128M
crashkernel=384M-:128M vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127.2
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-05-08 (11 days ago)
dmi.bios.date: 12/22/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 2.20
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias:
dmi:bvnTOSHIBA:bvrVersion2.20:bd12/22/2011:svnTOSHIBA:pnTECRAR700:pvrPT318C-00F001:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: TECRA R700
dmi.product.version: PT318C-00F001
dmi.sys.vendor: TOSHIBA
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1321280
Title:
Sometimes can't adjust screen brightness
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