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When I reinstalled the custom OS, and then edited the xorg.conf file with the xvidtune info shown above, the screen still appears shifted up 1/4" versus what was displayed when FC5 was running (btw, X11 under FC5 ran "out-of-the-box" just fine, without any adjustments).
This is what I inserted into the xorg.conf file for the "Monitor" section:
Distribution: RHEL/CentOS/SL 5 i386 and x86_64 pata for IDE in use
The first link is about the "official" Nvidia driver. I know about this, but mine works.
Just a suggestion, mostly for others. I'm glad your setup works also
The second link is all about DPMS. To save me reading the whole thing---was I wrong about DPMS not being a factor in getting the right resolution settings?
Partly yes, with modern video interfaces and monitors probing with DPMS (and using DDE) can and does monitor resolutions. For example my laptop (Acer Aspire 5100) has a a wide screen (15.4) with a native resolution of 1280x800 which by default is utilized by the xorg.conf file I posted.
Thanks everyone for your replies so far. It's been awhile since I have been able to return to the issue I originally posted.
My company finally was nice enough to provide me with my own system (with the ATI chip-set) that I can play with it. Now I can attempt to troubleshoot the X11 issue from the comfort of my home.
One thing I have found interesting is that the custom Linux OS and s/w applications that came installed on this system work fine. These are from a Release Candidate dated May 04, 2007. However, if I update the s/w with today's version, then I see the X11 screen shifted upward.
Is there anything that can explain this? The xorg.conf file, the X11 drivers, and for that matter the entire OS, are the same. The only thing that has changed is a proprietary applications (C++ daemon processes and Qt GUI) that my company develops.
After X11 is started, the gray-pixel screen is shifted by 1/4" (64mm) up, with a black bar shown below. When the Qt GUI is launched, it takes up the entire screen, however it too is shifted up. This is apparent by examining the position of buttons, labels, etc.
Any ideas where I can focus my attention on how to resolve this issue? I am completely stumped on what else I can do.