Distribution: Gentoo
Hardware Environment: ASUS P4C800E-Deluxe
Software Environment: acpi=off
Problem Description: radeon framebuffer doesn't get initialized unde 2.4.x
kernels, but it works under 2.6. :(

This is what I get on 2.4.27-pre3 for example:
radeonfb: ref_clk=2700, ref_div=12, xclk=20000 from BIOS
radeonfb: detected DFP panel size from BIOS: 1280x1024
radeonfb: cannot map FB

VESA framebuffer works fine in kernel and also X works fine when using
Driver "vesa"
instead of "radeon" (screen goes off in that case).

$ cat /proc/interrupts 
           CPU0       
  0:      36510    IO-APIC-edge  timer
  1:       1532    IO-APIC-edge  keyboard
  2:          0          XT-PIC  cascade
  8:          2    IO-APIC-edge  rtc
 14:         11    IO-APIC-edge  ide2
 16:          0   IO-APIC-level  usb-uhci, usb-uhci
 17:          0   IO-APIC-level  Intel ICH5
 18:      15895   IO-APIC-level  ide0, usb-uhci, eth0
 19:       4772   IO-APIC-level  usb-uhci
 20:          2   IO-APIC-level  ohci1394
 23:          0   IO-APIC-level  ehci_hcd
NMI:          0 
LOC:      36434 
ERR:          0
MIS:          3
$

# lspci
0000:00:00.0 Host bridge: Intel Corp. 82875P Memory Controller Hub (rev 02)
0000:00:01.0 PCI bridge: Intel Corp. 82875P Processor to AGP Controller (rev 02)
0000:00:03.0 PCI bridge: Intel Corp. 82875P Processor to PCI to CSA Bridge (rev 02)
0000:00:1d.0 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #1
(rev 02)
0000:00:1d.1 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #2
(rev 02)
0000:00:1d.2 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #3
(rev 02)
0000:00:1d.3 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #4
(rev 02)
0000:00:1d.7 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB2 EHCI
Controller (rev 02)
0000:00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB/ER Hub interface to PCI
Bridge (rev c2)
0000:00:1f.0 ISA bridge: Intel Corp. 82801EB/ER (ICH5/ICH5R) LPC Bridge (rev 02)
0000:00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) Ultra ATA 100
Storage Controller (rev 02)
0000:00:1f.2 IDE interface: Intel Corp. 82801EB (ICH5) Serial ATA 150 Storage
Controller (rev 02)
0000:00:1f.3 SMBus: Intel Corp. 82801EB/ER (ICH5/ICH5R) SMBus Controller (rev 02)
0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801EB/ER (ICH5/ICH5R)
AC'97 Audio Controller (rev 02)
0000:01:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200]
(rev 01)
0000:01:00.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200]
(Secondary) (rev 01)
0000:02:01.0 Ethernet controller: Intel Corp. 82547EI Gigabit Ethernet
Controller (LOM)
0000:03:03.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 46)
#


Steps to reproduce: