ati radeon 9550

[toor81]

Hello, i run linux mint felicia and i have ati radeon 9550, i whas ubuntu user for several years using the same ati radeon 9550, it whas an nigthmere . My best gues is becose of the poor fglrx proprietary driver wich it crash my linux instalation evry time.Nevertheless since ubuntu 8.04 i whas able to run compiz-fusion with 3D desktop in deacent condition,the same i vhas been able to play 3D games(Urban Terror, Planet Penguin Racer , TORX, Nexius, Cube . . . allot of them , and manny more) on ubuntu and mint,without using the damnet fglrx proprietary driver, in very good condition.
However regnum online it does not work i got this message:

Unsupported video card!

Your video card is too old
You haven't installed the latest available drivers

My question is: it is possibile to play regnum on this grafic board using open source drivers or propryetary driver?
There is somone else using this grafic board and it has manage to play RO, How?

TNX
And one more time i use linux mint felicia 2.6.27-7 generic felicia is based on xubuntu 8.10 intrepid, using fluxbox 1.0.0 and Xorg 7.4.
TNX Again