Description of problem:
I've got a machine with an Intel Corporation 82G965 Integrated Graphics Controller (rev 02).  Starting with the 2.6.18-118.el5 kernel (where lots of fixes went in to support Cantiga and Eaglelake) X no longer works on the box.  Instead I get:

(WW) INTEL: No matching Device section for instance (BusID PCI:0:2:1) found
(EE) GARTInit: Unable to open /dev/agpgart (No such file or directory)
(EE) INTEL(0): Failed to allocate framebuffer. Is your VideoRAM set too low?

Version-Release number of selected component (if applicable):
2.6.18-118.el5 and 2.6.18-119.el5

How reproducible:
Always

00:02.0 0300: 8086:29a2 (rev 02)
        Subsystem: 8086:514d
        Flags: bus master, fast devsel, latency 0, IRQ 177
        Memory at 90300000 (32-bit, non-prefetchable) [size=1M]
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3110 [size=8]
        Capabilities: [90] Message Signalled Interrupts: 64bit- Queue=0/0 Enable-
        Capabilities: [d0] Power Management version 2

00:02.1 0380: 8086:29a3 (rev 02)
        Subsystem: 8086:514d
        Flags: bus master, fast devsel, latency 0
        Memory at 90200000 (32-bit, non-prefetchable) [size=1M]
        Capabilities: [d0] Power Management version 2