In my opinion, the screen is always too dark in every distro I have tried. It normally is not a problem, when using KDE at least, because of this control center function. Unfortunately, it does not work in Debian. Usually, it's stated that "administrative privilege is required" and the admin button is supplied. Not so in Debian--no button. You can make all the changes to gamma and the colors that you wish, and save them to XF86 or whatever, but nothing will change on the screen after a reboot.

So, does anyone have any thoughts on how to get the changes to work??? Have I found a bug???

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Bill H

Hi,

I'm a little unclear about what you are tring to do, or rather how you are trying to do it. Am I right in thinking that you are using the KDE control centre to set your gamma and you are unable to get sufficient admin. permission in Debian?

Right you are.. To be a bit more clear: go to Control center then scroll down to 'peripherals' and open it, then within that, go to 'display' and open that. You will see a tab saying "monitor gamma"--select it. Now you will see at the bottom area, 4 sliders, one for gamma and 3 for the colors. In case you don't know, 'gamma' is basically brightness/contrast combined. In every other KDE distro I've worked with there is also a 'button' for Administrative Privilege to allow changes in this function. There is no such button in Debian, therefore changes will not work. The changes only take effect after restarting the X server (reboot). So, how do I get the admin privilege without a 'button' to ask for it???

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Bill H

Got you.

This should work:

Open a terminal
Type Then your root password

Then type This should open control centre with administrator privileges.

If not then post back!

This workaround is a great way to perform actions with root privilege, remember not to take the name of root in vain though!

Good luck...

That doesn't make much sense does it? He wants to change the control in Gnome.

I have never used it, but since you want to use the GUI adjuster, you may have to log into Gnome as root.

Edit ... Oh! Maybe not. I guess he may still be using KDE.

rickh, you are right, Gnome would be his default install. I don't think the Etch installer gives a KDE/Gnome choice.

So does the question become

"How do I adjust my screen gamma in Gnome?"

A question I can't answer


Tell us Bill, don't be shy!

Is it Gnome or KDE?

I'm pretty sure actually that Bill is using KDE. His second post makes that clear to me anyway. There are numerious methods of initially installing KDE instead of GNOME btw.


In my Control Centre (in Etch), I only have 2 tabs on the 'Display' section of Peripherals - 'Size and Orientation' and 'Power Control'.

If you are using an Nvidia card with their closed driver, open nvidia-settings ('NVIDIA X Server Settings' under the System menu in KDE) and check out the 'X Server Colo(u)r Correction' section. Brightness, Contrast and Gamma can all be adjusted there. Any changed settings ought to be saved to ~/.nvidia-settings-rc. Sorry but I can't speak to what ATI has to offer in this regard.

Thanks guys--yeah, I'm using KDE, there are too many things I can't control at all in Gnome. Maybe I should have mentioned that this forum labeled me "newbie", but that only applies to the forum. I am very much NOT a newbie in the computer world. I've been working with various distros for a couple of years, learning what I can. On this particular problem, I'm about to decide that Debian just isn't going to work properly with the Nvidia FX AGP card that I have. There isn't even a setup function for it as there is in several other distros. Oh, well, I like Debian, but there are a whole bunch more out there to look at. I also like Slackware-(BTW SLAX is a real blast if you get a chance to look at it) and I like Mandrake, but I wonder how much support there is going to be for it. I may end up with something like SUSE--I like 10.0 better than 10.2, which looks a lot like Windows.. Anyway, thanks again...

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Bill H

It'll work on Debian, but Debian doesn't hold your hand or assume you're an idiot; and it doesn't provide tools for non-free proprietary drivers. If you're not ready for Debian yet, there's certainly no disgrace in that, but if you want it to work, this may make it easier.

Thanks Rick. I'll print that out and spend some time looking it over. I really like Debian, but I work a lot with graphics, and I like to have a more lifelike screen color in them. Right this moment, I'm running Mandriva 2007, but I don't think I really like it. I've got HDs set up so I can load anything at a moment's notice.

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Bill H