Confirming this issue on Gutsy Gibbon with FGLRX 8.02 (released 13th Feb 08). 
Running with KDM, so I've tried with the following remedies (which did not do 
it for me):
 * TerminateServer=true in kdmrc
 * Option      "AGPMask"    "0x00000005" # Disable 1x and 4x
 * Option      "UseInternalAGPGART" "no"

However, I _am_ able to shift to console mode using Ctrl-Alt-Fx and back
to X with no problems, but log outs and Ctrl-Alt-Backspace freezes the
machine so that Caps Lock/Num Lock no longer can be toggled - but SysRq
works.

This is what is present in the log file up to the point of the freeze:
Feb 15 09:35:57 nc6000 kernel: [fglrx] interrupt source 10000000 successfully 
disabled!
Feb 15 09:35:57 nc6000 kernel: [fglrx] enable ID = 0x00000000
Feb 15 09:35:57 nc6000 kernel: [fglrx] Receive disable interrupt message with 
irqEnableMask: 10000000; dwIRQEnableId: 00000005
Feb 15 09:35:57 nc6000 kernel: [fglrx] interrupt source 20008000 successfully 
disabled!
Feb 15 09:35:57 nc6000 kernel: [fglrx] enable ID = 0x00000000
Feb 15 09:35:57 nc6000 kernel: [fglrx] Receive disable interrupt message with 
irqEnableMask: 20008000; dwIRQEnableId: 00000004
Feb 15 09:36:29 nc6000 kernel: SysRq : Emergency Sync
Feb 15 09:36:29 nc6000 kernel: Emergency Sync complete

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log out or switch user results in crash
https://bugs.launchpad.net/bugs/107115
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