Public bug reported:
Backlight control does not work, but there are entries in /sys/class/backlight.
This is a new laptop, I have not tried any previous kernel versions.
Hotkeys do not change the brightness but do cause the OSD to pop up indicating
what the brightness should be.
Brightness applet does not work.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-19-generic 3.13.0-19.39
ProcVersionSignature: Ubuntu 3.13.0-19.39-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: useradmin 3496 F.... pulseaudio
/dev/snd/controlC0: useradmin 3496 F.... pulseaudio
CurrentDesktop: GNOME
Date: Sat Mar 22 22:52:23 2014
HibernationDevice: RESUME=UUID=a3e237f6-10cb-43a3-b9ed-ecfbc16de751
InstallationDate: Installed on 2014-03-22 (1 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
MachineType: Hewlett-Packard HP EliteBook 850 G1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-19-generic
root=UUID=1209f2bc-bc3e-44ae-bf60-8c0bcb5cfb1e ro access=m2 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: 02/19/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L71 Ver. 01.08
dmi.board.name: 198F
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 15.54
dmi.chassis.asset.tag: CNU345C1WF
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvrL71Ver.01.08:bd02/19/2014:svnHewlett-Packard:pnHPEliteBook850G1:pvrA3009DD10303:rvnHewlett-Packard:rn198F:rvrKBCVersion15.54:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 850 G1
dmi.product.version: A3009DD10303
dmi.sys.vendor: Hewlett-Packard
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
** Attachment added: "backlight"
https://bugs.launchpad.net/bugs/1296208/+attachment/4038403/+files/backlight
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https://bugs.launchpad.net/bugs/1296208
Title:
Backlight controls not working on HP Elitebook 850 G1
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