gpothier, thank you for reporting this and helping make Ubuntu better. Could you please provide the information following https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Report_Minimum_Requirements ?
As well, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the kernel in the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested and remove the tag: needs-upstream-testing This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the text: needs-upstream-testing If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags: kernel-unable-to-test-upstream kernel-unable-to-test-upstream-VERSION-NUMBER Please let us know your results. Thank you for your understanding. ** Description changed: - On an HP Folio 13, the monitor's backlight does not work by default. It is necessary to add a kernel parameter through grub's config to make it work: + On an HP Folio 13, the monitor's backlight does not work by default. + + WORKAROUND: Add a kernel parameter through grub's config to make it work: acpi_backlight=vendor - (see http://labo.eliaz.fr/spip.php?article94) + + See http://labo.eliaz.fr/spip.php?article94 . ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: linux-image-3.5.0-17-generic 3.5.0-17.28 ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5 Uname: Linux 3.5.0-17-generic x86_64 ApportVersion: 2.6.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: gpothier 1892 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC0: gpothier 1892 F.... pulseaudio Date: Sat Oct 13 00:25:35 2012 HibernationDevice: RESUME=UUID=281e4254-f100-4193-8e7d-13c4d9785734 MachineType: Hewlett-Packard HP Folio 13 Notebook PCC ProcEnviron: - TERM=xterm - PATH=(custom, no user) - XDG_RUNTIME_DIR=<set> - LANG=en_US.UTF-8 - SHELL=/bin/bash + TERM=xterm + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + SHELL=/bin/bash ProcFB: - 0 EFI VGA - 1 inteldrmfb + 0 EFI VGA + 1 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=acdbf868-560a-4ec7-8772-45c16c166819 ro acpi_backlight=vendor quiet splash vt.handoff=7 RelatedPackageVersions: - linux-restricted-modules-3.5.0-17-generic N/A - linux-backports-modules-3.5.0-17-generic N/A - linux-firmware 1.95 + linux-restricted-modules-3.5.0-17-generic N/A + linux-backports-modules-3.5.0-17-generic N/A + linux-firmware 1.95 SourcePackage: linux StagingDrivers: rts_pstor UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/05/2012 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: F.06 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 17F8 dmi.board.vendor: Hewlett-Packard dmi.board.version: 46.34 dmi.chassis.asset.tag: Chassis Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnHewlett-Packard:bvrF.06:bd03/05/2012:svnHewlett-Packard:pnHPFolio13NotebookPCC:pvr068C100000204A00000320100:rvnHewlett-Packard:rn17F8:rvr46.34:cvnHewlett-Packard:ct10:cvrChassisVersion: dmi.product.name: HP Folio 13 Notebook PCC dmi.product.version: 068C100000204A00000320100 dmi.sys.vendor: Hewlett-Packard ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Tags added: needs-upstream-testing -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1066211 Title: Screen backlight problem on HP Folio 13 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1066211/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
