Problems with console video

[Markus Tarköy]

Hi everybody,
I encounter some video problem when I launch X and then end the session and
go back to console.
This is what happens:

1. Boot into Linux via BootX (Oldworld machine), no video driver checked
--> my console looks allright
2. startx --> KDE starts up, all looks allright
3. logout from KDE session and now just black screen on all virtual
terminals (I can still type and halt the machine)

Hardware: beige G3 (+Sonnet G4 upgrade 400 MHz), 352 MB, ATI Radeon 7000
Mac Edition, Miro Display 1770

Any hints and suggestions to improve this situation are highly welcome :)
Regards Markus