Dmitriy: Yes it is a dirty hack :) I don't know of any other applications that would increment the backlight up and down, and GNOME's ability to set the brightness to a specific percentage (without going through steps inbetween) *should* still be functional with it...although even the unpatched gnome-settings-daemon in Debian Wheezy doesn't know how to handle simple things like "dim on battery power" correctly yet so I can't test that conclusively right now.
I think that your solution might require a patch to the kernel itself. At least in my case, backlight keypresses are handled by the thinkpad- acpi module, and I'm guessing non-thinkpad problem laptops use the kernel's built-in acpi functionality. I could be wrong though. Either way, this bug now belongs to gnome-settings-daemon, since all power-handling functionality has moved over there. This bug entry should probably be marked 'Invalid' as you said, and a new bug should be opened. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/527157 Title: Brightness controls skips Levels. Status in “gnome-power-manager” package in Ubuntu: Triaged Status in “gnome-power-manager” package in Arch Linux: New Bug description: Binary package hint: gnome-power-manager Expected: Hitting brightness up key or brightness down key changes brightness by one level out of 15. Actual: Hitting brightness up key or brightness down key changes brightness by two or three levels out of 15. When I use the brightness control keys from a fresh install, the brightness jumps THREE increments. By creating /etc/modprobe.d/video.conf and setting options video brightness_switch_enabled = 0 I reduce this to consistently TWO brightness events, but this is still double the normal events. If I kill gnome-power-manager, it returns to single brightness events. when hitting brightness up/down with gnome-power-manager, udevmonitor shows UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent KERNEL[1267026969.897008] change /devices/virtual/backlight/acpi_video0 (backlight) UDEV [1267026969.898270] change /devices/virtual/backlight/acpi_video0 (backlight) KERNEL[1267026969.903078] change /devices/virtual/backlight/acpi_video0 (backlight) UDEV [1267026969.903842] change /devices/virtual/backlight/acpi_video0 (backlight) KERNEL[1267026971.355970] change /devices/virtual/backlight/acpi_video0 (backlight) UDEV [1267026971.357418] change /devices/virtual/backlight/acpi_video0 (backlight) with gnome-power-manager not running, it shows no events. Before: cat /proc/acpi/video/IGD0/LCD/brightness levels: 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 current: 25 Brightness up pressed: cat /proc/acpi/video/IGD0/LCD/brightness levels: 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 current: 40 With options video brightness_switch_enabled = 0: cat /proc/acpi/video/IGD0/LCD/brightness levels: 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 current: 25 Brightness up pressed: cat /proc/acpi/video/IGD0/LCD/brightness levels: 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 current: 35 With brightness_switch_enabled=0 and gnome-power-manager not running: cat /proc/acpi/video/IGD0/LCD/brightness levels: 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 current: 25 Brightness up pressed: cat /proc/acpi/video/IGD0/LCD/brightness levels: 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 current: 30 Description: Ubuntu lucid (development branch) Release: 10.04 xserver-xorg-video-intel: Installed: 2:2.9.1-1ubuntu1 Candidate: 2:2.9.1-1ubuntu1 Version table: *** 2:2.9.1-1ubuntu1 0 500 http://archive.linux.duke.edu lucid/main Packages 100 /var/lib/dpkg/status gnome-power-manager: Installed: 2.29.1-0ubuntu2 Candidate: 2.29.1-0ubuntu2 Version table: *** 2.29.1-0ubuntu2 0 500 http://archive.linux.duke.edu lucid/main Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/527157/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
