Alkis Georgopoulos, the issue you are reporting is an upstream one. It would be nice if somebody having it could send the bug to the developers of the software by following the instructions verbatim at https://wiki.ubuntu.com/Bugs/Upstream/kernel . If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about the status. Thanks in advance.
Marking Triaged as mainline tested. ** Description changed: In 2.6.32 (Lucid) there's an /sys/devices/virtual/backlight/acpi_video0 interface for Aspire 5742Z, and brightness hotkeys do modify the values of the files in that dir, but the actual laptop brightness isn't changed. In 3.0.0-9 (Oneiric beta 1) there's no /sys/devices/virtual/backlight interface at all. If I boot with acpi=off, the brightness keys correctly modify brightness, but of course I lose all other ACPI functionality. I tried some of the other acpi-related kernel parameters (acpi_backlight=vendor etc) mentioned in - * https://wiki.ubuntu.com/Kernel/Debugging/Backlight - * https://wiki.ubuntu.com/DebuggingACPI - * www.kernel.org/doc/Documentation/kernel-parameters.txt - * http://www.lesswatts.org/projects/acpi/debug.php + * https://wiki.ubuntu.com/Kernel/Debugging/Backlight + * https://wiki.ubuntu.com/DebuggingACPI + * www.kernel.org/doc/Documentation/kernel-parameters.txt + * http://www.lesswatts.org/projects/acpi/debug.php to no avail, brightness only works with acpi=off or acpi=ht. I tried the fwts tool for ACPI testing, and it produced some errors, I'm attaching the output. I also tried playing with acpiexec, but calling the _BCM method didn't change the brightness either. `ubuntu-bug linux` doesn't work from the oneiric beta live CD, I'll manually attach lspci etc as well. + + ProblemType: Bug + DistroRelease: Ubuntu 12.04 + Package: linux-image-3.2.0-24-generic 3.2.0-24.37 + ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 + Uname: Linux 3.2.0-24-generic x86_64 + AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. + ApportVersion: 2.0.1-0ubuntu7 + Architecture: amd64 + ArecordDevices: + **** List of CAPTURE Hardware Devices **** + card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog] + Subdevices: 1/1 + Subdevice #0: subdevice #0 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: alkisg 1705 F.... xfce4-volumed + alkisg 1736 F.... pulseaudio + Card0.Amixer.info: + Card hw:0 'Intel'/'HDA Intel at 0xb4400000 irq 44' + Mixer name : 'Intel IbexPeak HDMI' + Components : 'HDA:10ec0272,10250487,00100001 HDA:80862804,80860101,00100000' + Controls : 27 + Simple ctrls : 13 + Date: Fri May 18 07:51:58 2012 + HibernationDevice: RESUME=UUID=52f7a35f-fad8-4c9d-baf1-3d3087278f3c + InstallationMedia: Xubuntu 12.04 "Precise Pangolin" - Alpha amd64 (20120201.1) + Lsusb: + Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub + Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub + Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub + Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub + Bus 001 Device 003: ID 064e:c21c Suyin Corp. + MachineType: Acer Aspire 5742Z + ProcEnviron: + LANGUAGE=el:en + TERM=xterm + PATH=(custom, no user) + LANG=el_GR.UTF-8 + SHELL=/bin/bash + ProcFB: 0 inteldrmfb + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=9ba52df4-ec9e-4e1c-bbd7-322f50437f94 ro quiet splash vt.handoff=7 + RelatedPackageVersions: + linux-restricted-modules-3.2.0-24-generic N/A + linux-backports-modules-3.2.0-24-generic N/A + linux-firmware 1.79 + SourcePackage: linux + StagingDrivers: mei + UpgradeStatus: No upgrade log present (probably fresh install) + dmi.bios.date: 08/10/2011 + dmi.bios.vendor: Acer + dmi.bios.version: V1.24 + dmi.board.asset.tag: Base Board Asset Tag + dmi.board.name: Aspire 5742Z + dmi.board.vendor: Acer + dmi.board.version: V1.24 + dmi.chassis.type: 10 + dmi.chassis.vendor: Acer + dmi.chassis.version: V1.24 + dmi.modalias: dmi:bvnAcer:bvrV1.24:bd08/10/2011:svnAcer:pnAspire5742Z:pvrV1.24:rvnAcer:rnAspire5742Z:rvrV1.24:cvnAcer:ct10:cvrV1.24: + dmi.product.name: Aspire 5742Z + dmi.product.version: V1.24 + dmi.sys.vendor: Acer ** Tags added: amd64 ** Changed in: linux (Ubuntu) Status: Confirmed => Triaged ** Also affects: linux Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/853244 Title: Acer Aspire 5742Z brightness keys not working To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/853244/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
