I have the same issue on Ubuntu 12.04 with KDE 4:4.8.4a-0ubuntu0.2: Sometimes the screen becomes very bright and after a while the backlight starts to flicker and then switches minimum brightness (as configured in the power management settings).
Also when I use the brightness keys (Fn+Up/Dn), the backlight will often just start to flicker instead of switching to the intended brightness. Sometimes it just allows to toggle minimum/maximum brightness, but skips all steps in between. The machine is a Samsung N140 with an Intel 945GSE graphics chipset. Ubuntu 12.04 kdelibs-bin 4:4.8.4a-0ubuntu0.2 xserver-xorg-video-intel 2:2.17.0-1ubuntu4.1 -- 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/382167 Title: LCD backlight flickers when adjusting it and when the system is idle Status in “gnome-power-manager” package in Ubuntu: Fix Released Bug description: Binary package hint: gnome-power-manager Since I installed Intrepid, adjusting the LCD brightness is always an annoying experience on my Acer 5720, both on AC power and on battery power. If I increase or decrease the brightness by one step with the Fn+left/Fn+right one of the following will randomly happen: - changing the brightness (as expected); - resetting the brightness to the minimum; - the brightness rapidly goes to the minimum, then to the desired amount. This may happen up to 2-3 times in a row, leading to an annoying short flicker. With the +/- buttons from the Brightness applet, the brightness seems to go to the minimum, then goes back, then to the minimum again, then to the new value. During these operations (which last about half a second), the applet is unresponsive, i.e. the slider changes its position only after it finished. Trying to drag the slider to the desired value, it behaves like I was pressing the +/- buttons many times, therefore the brightness flickers and slowly changes for some seconds. Sometimes it directly reaches the final value, sometimes it goes back for a certain amount then goes to the final values, sometimes it stops in the middle. All of this is VERY annoying. Moreover, I see some flicker happening some time after I don't move the mouse or press any key (always returning to the current brightness) and/or when I start again to use keyboard or the mouse. I repeat: before using Ubuntu 9.04, everything worked almost fine. The cause may be a conflict between gnome-power-manager and some other piece of software (kernel? brightness applet?), therefore I'm filing this to the g-p-m package. ProblemType: Bug ACAdapter: Present Architecture: i386 Battery: Present CPUScaling: Present DistroRelease: Ubuntu 9.04 LaptopPanel: Present Package: gnome-power-manager 2.24.2-2ubuntu8 ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gnome-power-manager Uname: Linux 2.6.28-11-generic i686 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/382167/+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
