Changing an LCD Screen Backlight's Brighness

I don’t know why, but the brightness of the backlight on my Dell Vostro 1520’ LCD screen sometimes switches to minimum for no apparent reason, and I can’t figure out how to increase it’s brightness back to normal! How can I fix this?

Do the Fn keys not work?
If you click the Battery monitor in the tray can you move the slider to increase it?

This particular laptop doesn’t have Fn keys for changing the monitor’s brightness, and the slider in the Power Management Popup has no effect on the actual brightness of the monitor… Perhaps something is wrong with my config?

It may be that it is not possible for your laptop or can you confirm it working before this?

I can adjust the brightness when using my WinXP Partition on this laptop… and I know that it occasionally comes up brighter in KDE, so I think this functionality does exist but isn’t being accessed properly by Linux

Edit: I just found realized where the Fn buttons for brightness are, and they do seem to work… but why not the screen brightness slider?

jwesleycooper wrote:

>
> I can adjust the brightness when using my WinXP Partition on this
> laptop… and I know that it occasionally comes up brighter in KDE, so I
> think this functionality does exist but isn’t being accessed properly by
> Linux
>
> Edit: I just found realized where the Fn buttons for brightness are,
> and they do seem to work… but why not the screen brightness slider?
>
>

Guess you may have to check the settings in Power Management, but good luck
with that, there are a plethora of settings in there and else where, most of
which I turn of/disable.
If the Fn keys work - great. I have my screen at full brightness all the
time anyway.