patch 4.6.99.17-4.6.99.18.diff.bz2 breaks i810 driver on Dell machines

Hello,

I'm building XFree86 4.6+patches for a selection of computers with various 
video chipsets.
The kernel is a 2.4.34.

I found that the patch 4.6.99.17-4.6.99.18.diff.bz2 breaks the i810 driver 
for the Intel
graphic chipset on these two Dell computers :

- Dell Optiplex GX270 / i865G
- Dell Optiplex GX280 / i915G

But note that this computer works well : Dell Optiplex GX260 / i845G

The syndrome : as soon as X startx, the screen becomes dark and the text 
consoles become unusable too
(but the system doesn't crash). I can see this in /var/log/XFree86.0.log 
(this example is for the i915G) :

[...]
(--) Chipset 915G found
(II) resource ranges after xf86ClaimFixedResources() call:
[...]
(II) Found conflict at: 0x3df
(II) Found conflict at: 0x3bb
(WW) ****INVALID IO ALLOCATION**** b: 0xe898 e: 0xe89f correcting^G
(II) window:
        [0] -1  0       0x00000000 - 0x0000ffff (0x10000) IX[B]
(II) resSize:
        [0] -1  0       0x00000000 - 0xffffffff (0x0) IX[B]
(II) window fixed:
        [0] -1  0       0x00000000 - 0x0000ffff (0x10000) IX[B]

and the log file stops here.

Moreover, I have the same graphic chipsets (i865G and i915G) on non-Dell 
motherboards
(MSI or Intel motherboards) and they work perfectly here. So I suspect 
that the problem comes from
the Dell BIOS. Dell BIOSes are mostly not configurable, as you may know, 
and I didn't find a parameter
which could be related to the problem.

There are some pci-related files which are altered by the patch, the error 
probably comes from there.

Loïc, Toulouse, France