I'm user of iBook G3 800 Mhz with M7 LW [Radeon Mobility 7500].
The problem is that Xserver can't recognise proper PLL parameters.
In /var/log/XFree86.0.log I can find someting like this:

XFree86 Version 4.4.0
Release Date: 29 February 2004
X Protocol Version 11, Revision 0, Release 6.6
Build Operating System:NetBSD/macppc 2.0.2_STABLE - The NetBSD
Foundation, Inc.
Current Operating System: NetBSD kermit.bezda.com 2.0.2_STABLE NetBSD
2.0.2_STABLE (GENERIC) #0: Mon Jul  4 18:15:32 CEST 2005
prezi@bezda.com:/home/prezi/src/sys/arch/macppc/compile/obj/GENERIC
macppc
Build Date: 04 July 2005

(WW) RADEON(0): No valid info for SCLK/MCLK for display bandwidth
calculation.
(WW) RADEON(0): Video BIOS not detected, using default PLL parameters!

There are patches for radeon_driver.c file but
is there any possibility to merge it to xscr tree by netbsd-team?
In my case (netbsd 2.0.2) patches I found does not fit to the xsrc.
Patch is not large and doing this will not take a long time.

Thank You very much!