Comment 3 for bug 529130

(In reply to comment #2)
> (In reply to comment #1)
> > Your monitor is connected through a VGA cable, right?
>
> Yes, See:
> http://traepaca.files.wordpress.com/2008/08/vga-plug.jpg
>
> > Doesn't it have h/v
> > position controls?
>
> Yes, have position controls.
>
> Problem:
>
> == Use Case ==
> 1) Start Ubuntu with driver nouveau and click button adjust automatic
> possition.
> 2) Reboot
> 3) Start Windows and click button adjust automatic possition
> 4) Reboot
> 5) Start Ubuntu with driver nouveau and click button adjust automatic
> possition.
> 6) Reboot
>
> Problem change manuality poss
>
> Driver Private work fine with Ubuntu and Windows, not necesary press button
> adjust automatic possition.
>

Most likely the blob defaults to a mode different from ours, could you attach Xorg logs from both nouveau and nvidia?

IIRC the blob usually doesn't print out any timings, so you'll have to run your X server with some high verbosity level, like:
# Xorg -logverbose 7