Backlight control does not work and there are no entries in /sys/class/backlight.

[Dom Johan]

Backlight control does not work and there are no entries in /sys/class/backlight.
No change using kernel parameter acpi_backlight=vendor.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-16-generic 3.8.0-16.26
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: dominic 1736 F.... pulseaudio
 /dev/snd/controlC0: dominic 1736 F.... pulseaudio
Date: Sat Apr 6 12:00:50 2013
HibernationDevice: RESUME=UUID=ff7ba7bc-5134-4ddf-b94f-1eac1bd18114
InstallationDate: Installed on 2013-02-03 (61 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130201.1)
MachineType: Hewlett-Packard HP Z1 Workstation
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-16-generic root=UUID=b50a7fc4-4835-489c-b0e0-1b8ca32fdf8f ro quiet splash ideo.use_bios_initial_backlight=0 vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.8.0-16-generic N/A
 linux-backports-modules-3.8.0-16-generic N/A
 linux-firmware 1.104
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/15/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: J52 v01.03
dmi.board.asset.tag: CZC2220YXN
dmi.board.name: 3561h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC2220YXN
dmi.chassis.type: 13
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrJ52v01.03:bd03/15/2012:svnHewlett-Packard:pnHPZ1Workstation:pvr:rvnHewlett-Packard:rn3561h:rvr:cvnHewlett-Packard:ct13:cvr:
dmi.product.name: HP Z1 Workstation
dmi.sys.vendor: Hewlett-Packard

[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 v3.9 kernel[0]. You will need to install both the linux-image and linux-image-extra .deb packages.

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/v3.9-rc6-raring/

[Launchpad Janitor (janitor)]

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