Trident CyberBlade/i1 & MSI 6368

I have 5 MSI 6368 Motherboards with onboard 
Trident Microsystems CyberBlade/i1 (rev 106) chips.

I can run XFree 3.3.6 on them without problems, but XFree 4.1,
XFree 4.2, and XFree 4-CVS (from a few weeks ago) all fail.

Tried Linux 2.4.18 and 2.5.46 (same results)

When I start X, it seems to start fine, the screen blinks
(very breefly), and the monitor indicates it's in
1152x864 mode (the mode I specified in XF86Config).

However, then things go silent. No reaction to the Contr-Alt-F1
key combination (switch to linux VC), and the screen stays black.
(no pointer visable eighter).

Even stranger: a few months back, I bought the same MSI 6368
motherboard, same CyberBlade/i1 rev 106 chip on it, and it
runs Xfree 4.2 flawlessly. (I have booted them all as diskless
stations, mounting excactly the same directories with the same
XFree 4.2 distribution on them, so I doubt the cause could be
my configuration)

For those interested, I've put the XFree86.0.log file at 
  http://iliana.komputilo.org/trident-cvs
and my XF86Config file:
  http://iliana.komputilo.org/XF86Config-trident0
output of `cat /proc/pci':
  http://iliana.komputilo.org/trident-proc

Is there anything I can do to test/help `real' programers
making XFree CVS run on them?
I'd be happy to try paches, running with more debug info, etc.

Thanks,
joost witteveen