can't see virtual consoles from/after X session
After I start an X session (with 'startx') I can switch to a virtual console (with 'ctrl-alt-F-whatever'), but all I get is a blank monitor.
The console is there and I can use it, but I can't see anything, so I have to type "blind."
This also happens after I log out of whatever window manager/desktop environment I'm using (KDE, fluxbox, etc.). At this point, I can type 'startx' (again), or 'shutdown -r now', or whatever, and it works, so I know the VC is there. I just can't see anything.
What can I do to fix this? Sorry if this is a FAQ. I'm sure I've seen something like this mentioned before, but I've tried Google etc. and can't find anything.
Any help would be much appreciated.