X fails after upgrade to 1.9

[Huub <"v.niekerk at hccnet.nl">]

Hi,

I just upgraded from 1.6 to 1.9 and now X fails to run:

xf86OpenSerial: Cannot open device /dev/psm0
	Device busy
Mouse0: Cannot open input device
PreInit failed for input device "Mouse0"
No core pointer

However, when I move my mouse, I do see the X-mousecursor move.

How can I solve this? BTW, in 1.6, X worked great.

Thanks,

Huub