Hi all, Hi Andy!
I've found a preliminary solution for that darn lockup-problem when leaving X to restart the X-Server or the whole system or simply going back to console while utilizing GeForce-4 cards with those new 4xxx drivers.
Everyone should have realized that the TV-Out feature is enabled by default even during system bootup. As far as I am concerned this seems to be the hassle responsible for those lockups.
How I got rid of it?
Got the 'nvtv'-Software from
installed it and before leaving X I simply start it and push the button "TV Off".
Form now on I could switch, restart or do whatever I've been used to while using the 31xx or my good old Geforce-2MX card.
Actually I've been using 'nvtv' for a long time since it's been the only Plug'nPlay-software for the TV-out on nVidia-cards but since I've bought my Albatron 4680SE (Philips encoder) the software became useless except for the turning-off-the-TV-mode thing.
Hope that helps some of you guys!
NOTE: TwinView needs to be set to off in XF86Config!