screen resolution detection problem in the new xorg 7.4

[Raziel88]

Os: LinuxMint Felicia RC1, based on Ubuntu Intrepid stable.
Machine: Amd Duron 1.3Gh, 768 MB RAM, Ati Radeon 9200 PRO (9250) video card with the default opensource driver.
Display: BENQ V551
Problem: Apparently, the new xorg doesn't recognize my screen resolution right, I get only a maximum of 800x600, although my monitor supports up to 1024x768, and even higher (the new Mandriva 2009 detected a resolution higher than this, don't now the dimension, that I didn't even know my monitor can support). The problem didn't appeared in Elyssa, so neither in Hardy, but appears in the new Fedora 10. I suspect that is a bug in the new xorg that causes that, but it is strange that Mandriva 2009 uses xorg 7.4 too, and works like a charm.
If there is a way to solve this quickly, please send me instructions, and I will make all that is possible to fix this in Felicia final. I want desperately to solve it till the final version arrives, in two weeks time. Thx.

[emorrp1 (emorrp1)]

you have to provide more information (e.g. output of inxi), or better yet, post in the forums as I've seen many of these solved by confirguration changes

[emorrp1 (emorrp1)]

also, is this still a problem in gloria?

[Launchpad Janitor (janitor)]

[Expired for Linux Mint because there has been no activity for 60 days.]