Let me try to explain what's happening:
After installing Kubuntu 6, I configured my card with the drivers provided by it (fglrx). It didn't work, so I then tried with the drivers directly from ATI.com. That didn't work either.
I have a Dell M991 (19") and a E153FP (15").
What happens is that when I set the resolution for the 19" to anything *other* than 2048x1536, and the 15" to any resolution, both monitors work as if they didn't support the resolution natively, and they act as "viewports". Kind of like a virtual resolution, where by moving the cursor to the edges of the screen makes it pan accross all the screen space. I think this is typical on laptops, where you can set higher resolutions than the LCD will support and it'll create this kind of "virtual resolution".
Strange thing is that if I set the 19" to 800x600, it still creates a virtual resolution, of course with *huge* windows and fonts. And strangest of all is that I don't believe this monitor supports anything higher than 1600x1200, so it seems weird that it works as *expected* only when using the high resolution I mentioned earlier.
Another strange thing is that on the Screen hardware manager, it shows two video cards, both "ATI Radeon (fglrx)", the difference being that one shows two monitors and another one just shows one, and also under "driver" one shows "fglrx" and the other shows "ati".
Note that I *don't* have two cards, just one (and the one integrated with the mobo).
I hope I explained the problem correctly, but if I didn't I suppose I could record a short movie with my phone and upload it so you can clearly see what the problem is.
On an unrelated not-so-important issue, I find it disconcerting that when the monitors have different resolutions, the windows appear larger on the lower resolution one, and also that I can go from one monitor to the other through the "no-shared" zone (if the smaller monitor is aligned to the top, you'd expect that the cursor couldn't go from the big to the small one passing through the lower edge), which is also frustrating (because the cursor jumps too much). Not that I miss Windows, but these weren't issues on there... (feel free to ignore this whole paragraph).
Please help me out, I've been dealing with this since yesterday when I made the switch from Windows XP. I actually find the experience overall to be much more pleasant (and powerful), albeit this irritating issue with the monitors.
Thanks in advance!
- Ivan V.