To make it clear about 'Option "UseFBDev" "true"': it wasn't in the first 
autoconfiged xorg.conf (first backup) but it was in the xorg.conf (second 
backup) that resulted from my first booting in recovery mode and selecting xfix.
I never added it myself and it never appeared again later, even by using xfix.
Should I use it?
It doesn't seem to make a difference but, while I was using it, ...

I was playing with XnView in fullscreen mode when this happened :

Apr  4 04:41:58 mamou-ubuntu gdm[5312]: WARNING: gdm_slave_xioerror_handler: 
Fatal X error - Restarting :0 
Apr  4 04:41:59 mamou-ubuntu kernel: [ 3516.353196] agpgart: Found an AGP 2.0 
compliant device at 0000:00:00.0.
Apr  4 04:41:59 mamou-ubuntu kernel: [ 3516.355094] agpgart: Putting AGP V2 
device at 0000:00:00.0 into 4x mode
Apr  4 04:41:59 mamou-ubuntu kernel: [ 3516.356803] agpgart: Putting AGP V2 
device at 0000:01:00.0 into 4x mode

I looked in all logs and I found no better data.

Also, the system locks when I leave the computer idle for a very long
time (screen saver greys out the screen, this can resume OK, but after 1
idle hour or more of grey screen, the system stops responding to
anything).

What can I do to get better diagnostics?

-- 
VIA/S3G VT8623 [Apollo CLE266] display no longer works
https://bugs.launchpad.net/bugs/197514
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