Swapping a 4850 for a 4870x2 resulted in
Backtrace:
0: /usr/bin/X(xorg_backtrace+0x26) [0x4f1b66]
1: /usr/bin/X(xf86SigHandler+0x41) [0x485a61]
2: /lib/libc.so.6 [0x7f71dbd3a040]
3: /usr/lib/xorg/modules/drivers//fglrx_drv.so(atiddxProbeMain+0x65f)
[0x7f71d9ec943f]
4: /usr/bin/X(xf86CallDriverProbe+0xe4) [0x46dab4]
5: /usr/bin/X(InitOutput+0x651) [0x46f231]
6: /usr/bin/X(main+0x20e) [0x433bde]
7: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f71dbd255a6]
8: /usr/bin/X [0x433219]
Saw signal 11. Server aborting.
ddxSigGiveUp: Closing log
Unlike above, Crossfire was not enabled for the card.
Architecture: amd64
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: fglrx
Package: xorg-driver-fglrx 2:8.600-0ubuntu2
03:00.0 VGA compatible controller: ATI Technologies Inc R700 [Radeon HD 4870 X2]
Subsystem: ATI Technologies Inc Device 2542
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at a0000000 (64-bit, prefetchable) [size=256M]
Memory at d7000000 (64-bit, non-prefetchable) [size=64K]
I/O ports at 8000 [size=256]
[virtual] Expansion ROM at d6000000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: fglrx_pci
Kernel modules: fglrx
On this 4850 device the system was working:
05:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850]
Subsystem: Giga-byte Technology Device 21c0
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d5000000 (64-bit, non-prefetchable) [size=64K]
I/O ports at a000 [size=256]
[virtual] Expansion ROM at d4000000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: fglrx_pci
Kernel modules: fglrx
--
fglrx 8.600 segmentation fault with HD4850X2 and xserver 1.6
https://bugs.launchpad.net/bugs/364180
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