Should I suggest it as a bug?

[Fabio]

I ask you before doing a bug report. I'm testing hardy Heron now.
My problem is:

when i enable the ati 3d accelerator drivers from "Restricted drivers 
manager", after the reboot pc go to off mode..so that i can't see the 
desktop.. i have to restart it and reconfigure with dpkg-reconfigure 
xserver-xorg than it starts but withouth accellerated drivers..so that i 
can't use compiz, play games and so on..
I didn't have this problems before..in fact i used compiz and so on.. 
all this happens when i have done some upgrades of the kernel.
It doesn't work both with 2.6.22-14 and 2.6.24-14.
Do you suggest me to try the acients kernels?
Do you suggest me to report it as a bug?
Thanks and good job to all the team
Fabio