Re: 1.0-9629 doesn't get 1920x1200.
I have a few questions:
0) Why are you using a 1900x1200 modeline? Does commenting it out have any impact?
1) Please post a bug report against 1.0-9626 where the same modeline is working
Additionally, with 1.0-9629, please start X with the following command:
startx -- -logverbose 6
and then post a new bug report.