I am also affected by this bug. I am using Ubuntu 10.10 (AMD64) on a HP ENVY 14 with an Intel i5 CPU (and integrated GPU).
The fn keys (fn+f2 and f3) for controlling the brightness do work. However, the notify-osd is completly out of sync; while it could only be increased and decreased in five steps, the brightness itself could be changed in ten steps. The brightness could also be modified by editing "/sys/class/backlight/acpi_video0/brightness" by changing the existing number with another between 0 and 10 (see http://ubuntuforums.org/showthread.php?t=1593079). Adding "acpi_backlight=vendor" as suggested did however deactivate the fn keys (fn+f2 and f3) completely and /sys/class/backlight appeared to be empty. Ubuntu on the other hand did start with full bright screen but no way to modify the brightness. Something that could be interesting is the following: Settings in gnome- power-manager related to the backlight has no real effects, except on notify-osd. For example, although brightness_dim_battery (LCD dimming amount when on battery) was set to 50, unplugging the notebook had no effects on the brightness, but notify-osd appeared to be reduced by a half. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/351326 Title: screen brightness notification out of sequence with keypresses on Dell XPS M1530 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
