LCD screen thinks 1920 x 1200 is a 4:3 resolution
 

Hello all,

I am running Ubuntu, using Gnome desktop and am using the nvidia-glx driver for an Nvideo Geforce MX420 video card.

I have a Samsung 2443P, 24" widescreen LCD monitor.

I have my screen resolution set to 1920 x 1200.


This setup was working fine for a month and now, without touching anything, the monitor today shows black bars over the left and right edges of the screen.

I can boot the computer into Windows and everything is fine.

When I set my screen resolution in Linux to a 4:3 ratio, I can see all objects on my Gnome desktop. When I switch back to 1920x1200 resolution, I cannot see objects at the edges anymore.

It actually seems that the monitor thinks that it is being fed 1280x1024 resolution.

The monitor has no way to adjust or force it to work with Linux.

Has anyone else had a similar experience?

Does the refresh settings in xorg make any difference for this problem?

And I repeat, Windows works at 1920 x 1200 resolution. So I dont think the monitor is faulty, but I am baffled as to how all of a sudden things dont work when they were not tampered with (all i did was switch my monitor on today and see things have gone haywire).

Regards,
Greenie

UPDATE:

I just tried a few versions of Ubuntu and discovered that:

* Ubuntu 7.10 Gutsy Gibbon actually drives the screen at 1920 x 1200 by default without a problem.
* No other version of Ubuntu will drive my screen at 1920 x 1200
* All versions of Ubuntu will drive the screen at 1680 x 1050 and the entire width of the screen is used.


Remember, Ubuntu 6.10 used to drive my screen at 1920 x1200, I changed nothing at all, no updates were applied, absolutely nothing changed to the O/S. I just booted up one day and discovered 1920 x 1200 was no longer working on my screen. so this is very very odd.

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