9.0-RC2 - xf86-video-savage driver - whole system freeze

[Philipp Lengemann]

After upgrading from 8.2-Release to 9.0-RC2 on my T23 there's a problem
related to xf86-video-savage driver. Every time I start X, the
environment looks fine at the first sight. In my case Openbox starts
through xinit(1) and it runs. But after starting an application
just like Openbox context-menu or something through autostart.sh, the
whole system freezes. There's no other option than hard reset at this
moment and it doesn't leave anything like errorlogs. Vesa-driver works
smoothly.
Any ideas? Thanks in advance.

Latest ports:

xf86-video-savage-2.3.2
xorg-server-1.7.7_3,1
--
FreeBSD bsdmobil.YogSothoth 9.0-RC2 FreeBSD 9.0-RC2 #0: Sat Nov 12
18:09:11 UTC 2011
root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
--
vgapci0 at pci0:1:0:0:	class=0x030000 card=0x01fc1014
chip=0x8c2e5333 rev=0x05 hdr=0x00 
vendor	   = 'S3 Inc.'
device	   = 'SuperSavage IX/C SDR'
class	   = display
subclass   = VGA