BitsperPixel problem, SDL on DirectFB backend

Hi all,

I ran the SDL sample ?testwin? on on DirectFB backend.

It CAN display in 16 bpp correctly.

However, it CAN?T display anything in 32 bpp using ?testwin -bpp 32?.

The directfbrc config is as below,

system=bcmnexus

fbdev=/dev/brcm0

mode=640x480

pixelformat=ARGB

primary-layer=00

desktop-buffer-mode=backsystem

Does anybody know how to display in 32 bpp?

Thanks,

James