OK, I just tried matching your kernel config and wscons.conf (except for
the number of vt's, which I have set to 4), and it didn't make any difference.
The screen is still virtually black when I switch from the vt running X to
another one and when I exit X.  I don't use xdm.

On Sat, May 18, 2002 at 11:08:08PM +0000, Matthias Scheler wrote:
> In article <874rh5ev39.fsf@bundy.zhadum.de>,
> 	Mario Kemper <magick@zhadum.de> writes:
> > Same here with a Radeon8500. The funny thing is, that a friend with
> > the exact same setup (same board, same card) doesn't have this problem.
> > My guess is a leftover from an old X11 installation as my friend
> > did a complete celanup of /uxr/X11R6 before installing, or some
> > configuration issues.
> 
> I doubt that it is related to some XFree86 problem. I suppose it is
> related to WSCONS. My kernel configuration looks like this:
> 
> #
> # wscons options
> #
> # builtin terminal emulations
> #options 	WSEMUL_SUN		# sun terminal emulation
> options 	WSEMUL_VT100		# VT100 / VT220 emulation
> # different kernel output - see dev/wscons/wsdisplayvar.h
> #options 	WS_KERNEL_FG=WSCOL_GREEN
> #options 	WS_KERNEL_BG=WSCOL_BLACK
> # compatibility to other console drivers
> options 	WSDISPLAY_COMPAT_PCVT		# emulate some ioctls
> options 	WSDISPLAY_COMPAT_SYSCONS	# emulate some ioctls
> options 	WSDISPLAY_COMPAT_USL		# VT handling
> options 	WSDISPLAY_COMPAT_RAWKBD		# can get raw scancodes
> # see dev/pckbc/wskbdmap_mfii.c for implemented layouts
> #options 	PCKBD_LAYOUT="(KB_DE | KB_NODEAD)"
> # allocate a number of virtual screens at autoconfiguration time
> #options 	WSDISPLAY_DEFAULTSCREENS=4
> # use a large software cursor that doesn't blink
> #options 	PCDISPLAY_SOFTCURSOR
> # modify the screen type of the console; defaults to "80x25"
> #options 	VGA_CONSOLE_SCREENTYPE="\"80x24\""
> 
> Note that I disable the console color stuff. And that's my "wsconf.conf":
> 
> screen	1	-	vt100
> screen	2	-	vt100
> screen	3	-	vt100
> screen	4	-	vt100
> screen	5	-	vt100
> screen	6	-	vt100
> screen	7	-	vt100
> 
> The X11 server is launched by "xdm" on the 7th screen.
> 
> 	Kind regards
> 
> -- 
> Matthias Scheler                                  http://scheler.de/~matthias/