Ok. I figure the problem out. I got an xorg.conf file from another user
with a T61p, who didn't have any problems using kdm, and if I use his
refresh settings, both gdm and kdm works again.
I changed the refresh settings from:
Horizsync 30-70
Vertrefresh 50-160
to:
Horizsync 28-96
Vertrefresh 43-60
Which solved the problem.
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gdm greeter crashes when X is using vesa driver
https://bugs.launchpad.net/bugs/138718
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