Dell Optiplex GX270 with intel 82865G VGA

Hi All!

I have a Dell Optiplex GX270 PC with integrated VGA chip. lspci output:

00:00:02.0 VGA compatible controller: IntelCorp. 82865G Integrated Graphics Device (rev 02) (prog-if 00 [VGA])
Subsystem: Dell Computer Corporation: Unknown device 0151
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at e8000000 (32-bit prefetchable) [size=128M]
Memory at feb80000 (32-bit non-prefetchable) [size=521K]
I/O ports at ed98 [size=8]
Capabilities: <aviable only to root>

My problem: Knoppix 3.4 can't recognize and setting it. The X only work with vesa. In the Control Center screen size: 640x480 and refresh rate: 100 Hz.

Can anybody help me to use screen size 1024x768 ?

Bye