bad VIDIOCGFBUF from philips webcam driver

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kernel 2.4.18
pwc 8.5 (same with other
versions I have tried)
video4linux compiled in.
pwc as loadable mod.
lsmod shows it loaded ok.
--------------------------------
In my little c test program, 

device /dev/video0 opens ok

VIDIOCGCAP reports:
Philips 730 webcam,
capture sizes 160x120  to 640x480
type 1

The little light on the camera comes
on and straight off again when the
prog is run.

But VIDIOCGFBUF reports that the
size is 0x0, base is nil and bpl is 0,
and I don't get an image.

Since it opens ok and is clearly finding
the right device (there's only 1 physical device
on the usb bus), I'm baffled where to look next.
Any ideas welcome!

--------------------------------
NB I have also a RH7.3 partition on the
same machine. Booting into this allows
me to run x, and when I do xawtv runs
and displays camera input ok, while fbtv
blanks the screen briefly and reports 'can't
find useful capture format'
--------------------------------








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