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Message #52995
[Bug 1301580] Re: Backlight control does not work, but there are entries in /sys/class/backlight
I removed the nvidia driver (331.38) in order to avoid problems when
installing the upstream kernel. This, however, seemed to fix the issue,
because brightness control is now working with the noveau driver and the
stock kernel. This would mean that this is actually a bug in the
proprietary nvidia driver?
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https://bugs.launchpad.net/bugs/1301580
Title:
Backlight control does not work, but there are entries in
/sys/class/backlight
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Backlight control doesn't work in Ubuntu 14.04 on a Lenovo Thinkpad
T61. Neither using hotkeys nor the brightness applet.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-19-generic 3.13.0-19.40 [modified: boot/vmlinuz-3.13.0-19-generic]
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: tommi 1964 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Apr 2 22:53:56 2014
HibernationDevice: RESUME=UUID=3e4b62ed-a926-47a3-ae19-44b96d1376ee
InstallationDate: Installed on 2014-03-30 (3 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
MachineType: LENOVO 645745G
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-19-generic root=UUID=01d49c75-94f4-417c-beae-d16fd8b8df83 ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-3.13.0-19-generic N/A
linux-backports-modules-3.13.0-19-generic N/A
linux-firmware 1.126
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/06/2007
dmi.bios.vendor: LENOVO
dmi.bios.version: 7LETA7WW (2.07 )
dmi.board.name: 645745G
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7LETA7WW(2.07):bd12/06/2007:svnLENOVO:pn645745G:pvrThinkPadT61:rvnLENOVO:rn645745G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 645745G
dmi.product.version: ThinkPad T61
dmi.sys.vendor: LENOVO
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References