Changing from X to a virtual terminal doesn't work

[unai <unai@posta.unizar.es>]

In debian 2.2 with a Diamond FireGl 1000 pro, the screen goes
sleep when
I change *from X to a virtual terminal*. Virtual terminals works
fine
before starting Xserver. Xserver works well also, but it seems
like the
screen lose the sync or the video card doesn't get back well to
virtual
terminal vga mode. Getting back again from the virtual terminal
to X
works again. I tried with Xfree86 3.3.6 3dLabs xserver and with
XFree86
4.0.1. And the problem remains the same.

Anybody knows something about this problem... and a solution ?

Thanks,

Unai