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FC5 - Can't start X with vanilla kernel



Hello,

I've installed FC5, and I'm running X (KDE) without any problem.
Yesterday, I decided to migrate up to 2.6.16.11, and also tried 2.6.17-rc3.
So, I downloaded kernel from kernel.org, built it, applied the 'udev
migration'
procedure (as I'm not using initrd with vanilla kernels), and restarted the
machine. 
Good news, it is running fine, except that X doesn't work anymore... It does
start, I can 'hear' it changing the resolution (I have a CRT not an LCD
screen),
but the screen stays black, no cursor, and X goes eating 100% of the CPU,
being unkillable (though the machine can still be used, I can network-connect
without problem except latencies...).

Checking /var/log/messages, I can find :
May  1 19:09:38 riri kernel: agpgart: Found an AGP 3.0 compliant device at
0000:00:00.0.
May  1 19:09:38 riri kernel: agpgart: Badness. Don't know which AGP mode to
set. [bridge_agpstat:1f000a0a vga_agpstat:ff00021b fell back to:-
bridge_agpstat:1f000208 vga_agpstat:ff00021b]
May  1 19:09:38 riri kernel: agpgart: Bridge couldn't do AGP x4.
May  1 19:09:38 riri kernel: agpgart: Putting AGP V3 device at 0000:00:00.0
into 0x mode
May  1 19:09:38 riri kernel: agpgart: Putting AGP V3 device at 0000:01:00.0
into 0x mode
May  1 19:09:38 riri kernel: [drm] Setting GART location based on old memory
map
May  1 19:09:38 riri kernel: [drm] Loading R300 Microcode
May  1 19:09:38 riri kernel: [drm] writeback test failed

which is very likely the reasons for my problems, but I can't find why...

Before running FC5, I was an FC4 user, and I was also running a vanilla kernel
with X without such a problem...

Who should I blame for X not working ? Kernel, as it is the one part I
changed,
or X, as this was running fine before with the X from FC4 ?

lspci says :
00:00.0 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
00:00.1 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
00:00.2 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
00:00.3 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
00:00.4 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
00:00.7 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
00:01.0 PCI bridge: VIA Technologies, Inc. VT8237 PCI bridge [K8T800/K8T890
South]
00:07.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller
(rev 80)
00:08.0 RAID bus controller: Promise Technology, Inc. PDC20378 (FastTrak
378/SATA 378) (rev 02)
00:09.0 Communication controller: Conexant HSF 56k HSFi Modem (rev 01)
00:0a.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 Gigabit
Ethernet Controller (rev 13)
00:0c.0 Network controller: RaLink Ralink RT2500 802.11G Cardbus/mini-PCI (rev
01)
00:0f.0 RAID bus controller: VIA Technologies, Inc. VIA VT6420 SATA RAID
Controller (rev 80)
00:0f.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 81)
00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 81)
00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 81)
00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 81)
00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge
[KT600/K8T800/K8T890 South]
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237
AC97 Audio Controller (rev 60)
00:11.6 Communication controller: VIA Technologies, Inc. AC'97 Modem
Controller (rev 80)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM
Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AS [Radeon 9550]
01:00.1 Display controller: ATI Technologies Inc RV350 ?? [Radeon 9550]
(Secondary)


Please help,
Thanks a lot,
Paul


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