Description of problem:
On linux boot on a Tiger server X server cannot start.
Last displayed messages on screen are:

Probing for Video Card : ATI Technonlogy Inc Rage XL
Attempting to start native X server
Waiting for X server to start ... log located in /dev/null
1...2...3...4...5...X server started successfully
  File "/usr/sbin/firstboot", line 107, in ?
    fb.startGraphicalUI()
  File "/usr/share/firstboot/xfirstboot.py", line 74, in startGraphicalUI
    import gtk
  File "/usr/lib/python2.4/site-packages/gtk-2.0/gtk/__init__.py", line 76, 
in ?
    _init()
  File "/usr/lib/python2.4/site-packages/gtk-2.0/gtk/__init__.py", line 64, in 
_init
    _gtk.init_check()
RuntimeError: could not open display


With startx command use, error messages are:

(EE) ATI(0): Adapters found to be in VGA mode on server entry are not 
supported by the MMIO-only version of this driver.
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found
XIO:  fatal IO error 104 (Connection reset by peer) on X server ":0.0"
      after 0 requests (0 known processed) with 0 events remaining.



Version-Release number of selected component (if applicable):
Build ID: xorg-x11-server 1.1.1-25.fc6 ?

How reproducible:
Rebooting Linux or starting X server (with startx command)

Steps to Reproduce:
1.
2.
3.
  
Actual results:

No server X starts

Expected results:

Start of X server

Additional info: