Okay, I wasn't able to test the nvidia driver with the upstream kernel,
but I tested with another version of the nvidia driver with the stock
kernel. Backlight control works with nvidia 304 driver.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-unable-to-test-upstream
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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:
Confirmed
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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