apport information ** Tags added: apport-collected running-unity
** Description changed: SInce the upgrade to Ubuntu 12.10, hardware keys for regulating backlight brightness (fn+f4, fn+f5) change brightness in large increments, even though much finer control is available both through the Brightness and Lock dialog in Settings and by just setting the value in /sys/class/backlight/acpi_video0/brightness, for example: # echo 1 > /sys/class/backlight/acpi_video0/brightness /sys/class/backlight/acpi_video0/brightness accepts values 0-15, the default step seems to be 3 instead of 1 as expected, and as it was in Ubuntu 12.04. Partial workaround is to disable brightness switch # echo -n 0 > /sys/module/video/parameters/brightness_switch_enabled which cuts the step to 2. Moreover, adding kernel parameters "acpi_osi=Linux acpi_backlight=legacy" allows for even finer control in the Brightness and Lock dialog in Settings (finer than those 16 settings, including completely turning the backlight via the brightness slider) but breaks the hardware keys functionality completely. # lsb_release -rd Description: Ubuntu 12.10 Release: 12.10 + --- + ApportVersion: 2.6.1-0ubuntu3 + Architecture: amd64 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: rmo 1897 F.... pulseaudio + DistroRelease: Ubuntu 12.10 + HibernationDevice: RESUME=UUID=7c82e11d-4211-4789-90b6-7a20abd8aa82 + InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5) + MachineType: Dell Inc. Vostro V131 + Package: linux (not installed) + ProcEnviron: + TERM=xterm-256color + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: 0 inteldrmfb + ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic root=/dev/mapper/ubuntu-root ro + ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5 + 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 + Tags: quantal running-unity + Uname: Linux 3.5.0-17-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo + dmi.bios.date: 10/24/2011 + dmi.bios.vendor: Dell Inc. + dmi.bios.version: A03 + dmi.board.name: 0X3GJK + dmi.board.vendor: Dell Inc. + dmi.board.version: A03 + dmi.chassis.type: 8 + dmi.chassis.vendor: Dell Inc. + dmi.chassis.version: Not Specified + dmi.modalias: dmi:bvnDellInc.:bvrA03:bd10/24/2011:svnDellInc.:pnVostroV131:pvrNotSpecified:rvnDellInc.:rn0X3GJK:rvrA03:cvnDellInc.:ct8:cvrNotSpecified: + dmi.product.name: Vostro V131 + dmi.product.version: Not Specified + dmi.sys.vendor: Dell Inc. ** Attachment added: "AlsaInfo.txt" https://bugs.launchpad.net/bugs/1069357/+attachment/3407347/+files/AlsaInfo.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1069357 Title: Hardware keys change backlight brightness in much larger increments/steps than expected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
