Janne Moren, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? Can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .
If it remains an issue, could you run the following command in the development release from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report. apport-collect -p linux <replace-with-bug-number> Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream- testing' tag. 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 'needs-upstream-testing' text. 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'. Please let us know your results. Thanks in advance. ** Tags added: needs-upstream-testing ** Description changed: As the subject says: the backlight level on my Panasonic Let's Note CF-S9 stays at full brightness and does not physically change even though the kernel seems to believe it's changing it. * The backlight buttons work (I get the light level slider thing). Looking in /sys/class/backlight/panasonic: > ls actual_brightness bl_power brightness max_brightness power subsystem uevent max_brightness = "21", actual brightness = "21", "brightness = "21" If I pull down the brightness to half using the brightness controls: max_brightness = "21", actual brightness = "10", "brightness = "10" ** But the light level doesn't actually change ** Same thing if I change it directly: > sudo sh -c 'echo "5" >brightness' max_brightness = "21", actual brightness = "5", "brightness = "5" ** again, no physical change in light level ** This affects the CF-S9 machine, and the CF-N9 (same machine with or without a DVD unit). It may affect the CF-Y9 and CF-R9 as well, though their hardware may be somewhat different (different cpu clock). The main problem really is that at full brightness it is really bright, almost painful at night. Also, it really kills battery life. + WORKAROUND: gksudo gedit /etc/default/grub - Anything I can do to help debug this, let me know! + (which calls an editor) to replace in the file /etc/default/grub the line: + GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" + + with: + GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" + + Then execute: + $ sudo update-grub && sudo reboot ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: linux-image-2.6.32-22-generic 2.6.32-22.33 [modified: lib/modules/2.6.32-22-generic/kernel/drivers/input/tablet/wacom.ko] Regression: No Reproducible: Yes ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2 Uname: Linux 2.6.32-22-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. Architecture: amd64 ArecordDevices: - **** List of CAPTURE Hardware Devices **** - card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic] - Subdevices: 1/1 - Subdevice #0: subdevice #0 + **** List of CAPTURE Hardware Devices **** + card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic] + Subdevices: 1/1 + Subdevice #0: subdevice #0 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: janne 1412 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC0: janne 1412 F.... pulseaudio CRDA: Error: [Errno 2] Filen eller katalogen finns inte Card0.Amixer.info: - Card hw:0 'Intel'/'HDA Intel at 0xf4a20000 irq 22' - Mixer name : 'Intel G45 DEVIBX' - Components : 'HDA:14f15068,10f70000,00100302 HDA:80862804,80860101,00100000' - Controls : 9 - Simple ctrls : 4 + Card hw:0 'Intel'/'HDA Intel at 0xf4a20000 irq 22' + Mixer name : 'Intel G45 DEVIBX' + Components : 'HDA:14f15068,10f70000,00100302 HDA:80862804,80860101,00100000' + Controls : 9 + Simple ctrls : 4 Date: Thu Jun 3 09:38:58 2010 HibernationDevice: RESUME=UUID=6fd7f6ad-3b8d-4fc4-a6cd-206104a94db9 InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429) MachineType: Panasonic Corporation CF-S9JYEBDR PccardctlIdent: - Socket 0: - no product info available + Socket 0: + no product info available PccardctlStatus: - Socket 0: - no card + Socket 0: + no card ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=a1f2d382-4e79-41b4-ab46-29ae811e5102 ro quiet splash ProcEnviron: - LANGUAGE=sv:en - PATH=(custom, user) - LANG=sv_SE.utf8 - SHELL=/bin/bash + LANGUAGE=sv:en + PATH=(custom, user) + LANG=sv_SE.utf8 + SHELL=/bin/bash RelatedPackageVersions: linux-firmware 1.34 RfKill: - 0: phy0: Wireless LAN - Soft blocked: no - Hard blocked: yes + 0: phy0: Wireless LAN + Soft blocked: no + Hard blocked: yes SourcePackage: linux dmi.bios.date: 03/11/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: V1.00L19 dmi.board.asset.tag: No Asset Tag dmi.board.name: CFS9-1 dmi.board.vendor: Panasonic Corporation dmi.board.version: 1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Panasonic Corporation dmi.chassis.version: 001 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.00L19:bd03/11/2010:svnPanasonicCorporation:pnCF-S9JYEBDR:pvr001:rvnPanasonicCorporation:rnCFS9-1:rvr1:cvnPanasonicCorporation:ct10:cvr001: dmi.product.name: CF-S9JYEBDR dmi.product.version: 001 dmi.sys.vendor: Panasonic Corporation ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/588983 Title: Kernel backlight driver does not physically change the light level To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/588983/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
