ibook radeonfb mirroring

[Cedric Pradalier <cedric.pradalier@inrialpes.fr>]

Hi,
	I'm trying to make my ibook mirror its video output on the secondary
CRTC of the  Radeon Mobility M7 LW (7500). I tried using the m7mirror.c
srcs found on the net, modified from m3mirroc.c on
http://penguinppc.org/~benh/.

This basically do  ioctl(fd, FBIO_RADEON_SET_MIRROR, &value);
on /dev/fb0.

This does not work on my  2.6.3-rc2-ben1 kernel. After looking in the
sources (drivers/video/aty/radeon_base.c), I found the following (in
the ioctl function):
		case FBIO_RADEON_SET_MIRROR:
			if (!rinfo->is_mobility)
				return -EINVAL;

Is this normal ? As far as I understand this means that it is not
possible to set mirroring for mobility cards ? Why ?

I must say that I can clone display using a superposed xinerama layout,
but I lose 3D and mouse is only present on the flat panel.

THX
-- 
Cedric

"[Of course] I'm French! Why do think I have this outrageous 
accent, you silly king-a?!"  Monty Python and the Holy Grail