Panic on boot

I've been getting similar panics for the past 2 weeks or so on my HP 
Pavilion laptop (N5440, 850 MHz Pentium III).  Sometimes when I attempt 
to boot, like 1 out of 20 times, it doesn't panic for some reason.  But 
I do get the same results with every panic, so I know it's not a 
hardware problem.  These occur after "vga0" is probed.  It's an S3 
Savage chipset.

fault virtual address	=	0x104cd7dc
fault code		=	supervisor read, page not present
instruction pointer	=	0x8:0xc04f4804
stack pointer		=	0x10:0xc0c21d44
frame pointer		=	0x10:0xc0c21d54
code segment		=	base 0x0, limit 0xfffff, type 0x1b
				dpl0, pres 1, def32 1, gran 1
processor eflags	= interrupt enabled, resume, iopl=0
current process		= 0 (swapper)
kernel:		type 12 trap, code=0

stopped at module_lookupbyname+0x24: movl 0x1c(%ebx), %eax
module_lookupbyname(c06d27e1,0,0,c2bbf300,c06efb78) at 
module_lookupbyname+0x24
module_register_init(c0726a8,c1ec00,c1e000,c1ec00,c1e000) at
module_register_init+0x32
mi_startup() at mi_startup+0xb5
begin() at begin+0x2c