Description of problem:

For qualification testing of Rhel4 U1 Beta on Intel server platforms, tried 
installing Rhel4 U1 IA64 Beta on Tiger 2 and Tiger 4, and X fails to start. 
Text-based install is successful. Xorg.0.log states the ATI driver is loaded, 
adapter/driver support issue is encountered and the driver is unloaded (see 
Additional Information). 

After installing, tried symlinking X11R6 to the X11R6 of RHEL4 (no update, 
which uses previous version of X) mounted on the same machine and X starts no 
problem - module is 6.5.6 in both cases but X release is different and failure 
occurs on X release 6.8.2 but not on X release 6.8.1. This issue doesn't occur 
on Tiger with RHEL4 no update.

Video card: VGA Compatible controller: ATI Technologies Inc Rage XL (rev 27)

ATI driver is unloaded after this message 
(for more activity see Additional Information):

"ATI(0): Adapters found to be in VGA mode on server entry are not supported by 
the MMIO-only version of this driver."

Version-Release number of selected component (if applicable):

How reproducible:

Every time.

Steps to Reproduce:

1. Acquire IA64 platform (Tiger2, or Tiger4) 
2. Begin install of RHEL4 U1 
3. Observe Anaconda trying to start X 

  
Actual results:

X cannot be started. (ati driver is loaded, says the driver doesn't support 
the video adapter, and is unloaded according to Xorg.0.log).

Expected results:

X starts.

Additional info:

Excerpt from xorg.conf:

Section "Device"
        Identified  "Videocard0"
        Driver      "ati"
        VendorName  "Videocard vendor"
        BoardName   "ATI Mach64"

Excerpts from Xorg.0.log:

"(II) LoadModule: "ati"
(II) Loading /usr/X11R6/lib/modules/drivers/ati_drv.o
(II) Module ati: vendor="X.Org Foundation"
	compiled for 6.8.2, module version = 6.5.6
	Module class: X.Org Video Driver
	ABI class: X.Org Video Driver, version 0.7"

"(II) ATI: ATI driver (version 6.5.6) for chipset: ati"

"(II) Primary Device is: PCI 01:01:0
(II) ATI:  Candidate "Device" section "Videocard0".
(II) ATI:  Shared PCI/AGP Mach64 in slot 1:1:0 detected.
(II) ATI:  Shared PCI/AGP Mach64 in slot 1:1:0 assigned to active "Device" 
section "Videocard0".
(II) Loading sub module "atimisc"
(II) LoadModule: "atimisc"
(II) Loading /usr/X11R6/lib/modules/drivers/atimisc_drv.o
(II) Module atimisc: vendor="X.Org Foundation"
	compiled for 6.8.2, module version = 6.5.6
	Module class: X.Org Video Driver
	ABI class: X.Org Video Driver, version 0.7"

"(==) ATI(0): Chipset:  "ati".
(**) ATI(0): Depth 16, (--) framebuffer bpp 16
(EE) ATI(0): Adapters found to be in VGA mode on server entry are not 
supported by the MMIO-only version of this driver.
(II) UnloadModule: "ati"
(II) UnloadModule: "atimisc"
(II) Unloading /usr/X11R6/lib/modules/drivers/atimisc_drv.o
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found"