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Description of problem:
I have a Dell Dimension 4700C. Under Core 2.90 the VESA driver was selected and worked well. After an upgrade to Core 4 the same xorg.conf file does not work and is exactly the same file generated after running system-config-display --configure 

The X server does not get an error on startup but I do get the following message from startx:

(WW) VESA(0): Failed to set up write-combining range (0x26400000,0x7b0000)

The driver that actually worked is i810.

The actual display is just totally messed up and frozen. I can abort the server  via Ctl-Alt-F7.

I selected this as a high priority because I really don't expect people to be able to figure out what the correct colution is.

Version-Release number of selected component (if applicable):
system-config-display-1.0.29-1

How reproducible:
Always

Steps to Reproduce:
1. Upgrade from Core 2.90 to 4
2.
3.
  

Actual Results:  Display is trashed.

Expected Results:  See additional data below.

Additional info:

here's the new working xorg.conf section for the card:



Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "NoAccel"                   # [<bool>]
        #Option     "SWcursor"                  # [<bool>]
        #Option     "ColorKey"                  # <i>
        #Option     "CacheLines"                # <i>
        #Option     "Dac6Bit"                   # [<bool>]
        #Option     "DRI"                       # [<bool>]
        #Option     "NoDDC"                     # [<bool>]
        #Option     "ShowCache"                 # [<bool>]
        #Option     "XvMCSurfaces"              # <i>
        #Option     "PageFlip"                  # [<bool>]
        Identifier  "Card0"
        Driver      "i810"
        VendorName  "Intel Corp."
        BoardName   "Unknown Board"
        BusID       "PCI:0:2:0"
EndSection


here's the same section for what breaks my box:

Section "Device"
        Identifier  "Videocard0"
        Driver      "vesa"
        VendorName  "Videocard vendor"
        BoardName   "VESA driver (generic)"
EndSection

Here's the output of lspci:
522 > lspci
00:00.0 Host bridge: Intel Corporation 915G/P/GV/GL/PL/910GL Processor to I/O Controller (rev 04)
00:01.0 PCI bridge: Intel Corporation 915G/P/GV/GL/PL/910GL PCI Express Root Port (rev 04)
00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller (rev 04)
00:02.1 Display controller: Intel Corporation 82915G Express Chipset Family Graphics Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 2 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d3)
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03)
00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Modem Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation 82801FB/FR (ICH6/ICH6R) LPC Interface Bridge (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 03)
00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
04:07.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
522 >