So you have that issue too? I have the AL1951 and have been experiencing the same with any of the newer distributions. I wondered whether it was my ATI card of or my monitor but it's beginning to look as if the monitor is to blame. Probably not passing on its min/max values to the computer.
Anyway, the issue can be resolved by editing xorg.conf (or Xfree86).
Fist of all you'll need to do some research. You have to find out what are the horizontal and vertical refresh rates for your particular type of monitor. The "manual" that came with my LCD was really minimal and I didn't find any reference to this. I had to spend an hour on google before I could find a shop that specified the values in question as Vertical: 30-75 and Horizontal as: 30-82. It may be tempting to adopt these values for yourself but I'd have to advise against it. If your values are lower, you could find youself staring at a black screen before you know. So do the research. And please don't shoot me if you do need to search for an hour only to find that your refresh rates are identical to mine after all. As I said, I haven't got a clue what is appropriate in your case.
Then, once you've found the required information, you need to actually edit your xorg.conf. Note: If Suse was using XFree86 instead of Xorg, the file would be called XFree86.conf or something. The file should probably be under /etc/X11 (xorg.conf certainly is, don't know about XFree86 but I assume it is too).
Always back up this file before you edit. If something goes wrong, it's easy to place back. Without any backup, you would have to edit it manually again (which can be quite of unnerving when you've just lost your display and you're not clear just which value could be responsible for that).
Then you need to open the file and adjust the VertRefresh and HorizRefresh values to reflect the actual ones. You may also have to edit the screen resolution under the "Display Section". For example, if you monitor supports 1280x1024 but there isn't any reference to these values, you would simply add them to the resolution values that are already defined. Like:
"1280x1024" "800x600" "640x480"
This is just an example, of course.