wscons colors

Does anybody operate netbsd-current on a sparc64 with wscons on radeonfb?

My problem: as soon as console has switched from OpenFirmware to wscons
during booting, output becomes barely readable.

Cursor block is bright white, but all text and background colors are
slightly dissimilar shades of grey.

(Tried the default black on lightwhite as well as white on black /
green on black).

Unfortunately, I don't remember when this worked fine - definitely
with 5.99.44/45.

Problem seen with 5.99.47 and 5.99.56.

Regards,
	-is

Machine:

hw.machine = sparc64
hw.model = SUNW,Sun-Blade-1500-S (SUNW,UltraSPARC-IIIi @ 1503 MHz)
hw.ncpu = 1

Graphics:

radeonfb0 at pci2 dev 3 function 0: ATI Technologies Radeon 7000/VE QY
radeonfb0: Video BIOS not present
radeonfb0: No video BIOS, using default clocks
radeonfb0: refclk = 27.000 MHz, refdiv = 12 minpll = 125000, maxpll = 350000
radeonfb0: using static EDID
max_dotclock according to supported modes: 266946
radeonfb0: 64 MB aperture at 0x08000000, 64 KB registers at 0x00100000
radeonfb0: display 0: initial virtual resolution 1280x1024 at 8 bpp
radeonfb0: port 0: physical 1280x1024 85Hz
radeonfb0: port 1: physical 1280x1024 85Hz
wsdisplay0 at radeonfb0 kbdmux 1: console (fb, vt100 emulation)
wsmux1: connecting to wsdisplay0
wsdisplay0: screen 1-3 added (fb, vt100 emulation)
drm at radeonfb0 not configured

K