kernel panic during Red Hat Enterprise Linux 6 installation on Dell Optiplex 740 with ATI FirePro 2450 card

Issue

• Installing RHEL 6 on a Dell Optiplex 740 with ATI FirePro 2450 graphics card gives the following panic :

  [...]
  Non-volatile memory driver v1.3
  Linux agpgart interface v0.103
  agpgart-intel 0000:00:00.0: Intel 965Q Chipset
  agpgart-intel 0000:00:00.0: detected 7676K stolen memory
  agpgart: unable to get minor: 175
  agpgart-intel 0000:00:00.0: agp_frontend_initialize() failed
  general protection fault: 0000 [#1] SMP 
  last sysfs file: 
  CPU 0 
  Modules linked in:
  Pid: 1, comm: swapper Not tainted 2.6.32-71.el6.x86_64 #1 OptiPlex 745   
  [...]
  

• Installation proceeds without issues if the ATI card is removed.