Public bug reported: Binary package hint: hal
On a Gateway MP8708, MP8709 and other non-Gateways, HAL reports laptop_panel.num_levels=101 but /proc/acpi/video/VGA/LCD/brightness is: levels: 100 37 12 25 37 50 62 75 87 100 current: 0 gnome-power-manager (and probably other applications) assumes that num_levels means levels [0,num_levels) are valid. This is not the case for some backlights. When an application uses HAL to set the brightness to an illegal value, /sys/class/backlight/... does not complain but instead sets the brightness to 0. Since g-p-m uses 5% increments, the issue manifests as only brightnesses 0%, 25%, 50%, 75% and 100% working, at least for the complaints I've seen. Users have to press the brightness keys several times to to make it through all the dark settings to a working one. See the g-p-m bug https://bugs.launchpad.net/ubuntu/+source/gnome-power- manager/+bug/121833 for more information. ** Affects: hal (Ubuntu) Importance: Undecided Status: New -- Brightness only works at certain levels with g-p-m due to invalid levels https://bugs.launchpad.net/bugs/162725 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs