I've a small bug with GDM and NVidia drivers. When i stop a session, and ask my WM to return to GDM, it sometimes has a problem of sync (same behaviour as a resolution too huge for a screen). So i have to restart XFree (ctrl-alt-supp) in order to solve the problem. Nothing is written in the logs.
It may be difficult to solve this (because of the nvidia closed drivers)... Pierre
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