LXDE Forums

Dell Vostro 1700, recently installed with Ubuntu 13.10, sudo apt-get install lxde-desktop

Most things are working fine, but I can't get control of my screen brightness. Regardless of the settings in XFCE (accessed
via Preferences->Power Manager), my screen brightness drops to around 30 % (unusably dim)
as soon as I pull the mains adapter out, with no delay at all.

The configuration under XFCE ("On battery", Monitor tab, Brightness pause and level) are simply ignored.

My guess is that "some other" power manager from the underlying Ubuntu install
is actually in charge of things.

Any help in diagnosis and (of course) fixing would be gratefully received.

BugBear

I am not familiar with that Dell But can you use the controls on the hardware to increase the brightness?

Rex Bouwense wrote:I am not familiar with that Dell But can you use the controls on the hardware to increase the brightness?

The function keys work !! (which is surprising, since googling found many
people saying they don't, and describing elaborate ways to do it).

But the XFCE controls are still completely ineffective in
all regards.

BugBear

If the controls do not work, I would suspect that there is another power manager working such as the one that is installed by default with Ubuntu, i.e. the gnome power manager. See which power manager is running by running the following in the terminal.

I don't know of any power control myself in LXDE, but if I need to adjust the brightness on my laptop, I use the keyboard keys.

I believe that LXDE uses the XFCE Power Manager.