umm ~01:00a.m, finally found the problem.
Intel driver + DRI + GDM is not working, adding option to not use DRI in
xorg.conf (Option "NoDRI") solves the problem and GDM start
nicely -- for the first time in several days :)
It's more important to me GDM than DRI support (common, I don't expect
to play on a Presario 5000LA), so I can live with it. FPS in glxgears
dropped from 200fps to 40fps, but it's ok.
Weird that only GDM trigger this bug on the intel driver.
** Changed in: xorg (Ubuntu)
Status: Invalid => New
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete => New
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Broken Intel Video i810, upgrade from 8.04 to 8.10 Beta.
https://bugs.launchpad.net/bugs/279835
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