As far as I know the free "nv" driver doesn't support Composite, so it's normal it would work with them. Disabling Composite on your Ubuntu machine should work; you can also follow the instructions given in a related bug: Bug #35942
As far as I know the free "nv" driver doesn't support Composite, so it's normal it would work with them. Disabling Composite on your Ubuntu machine should work; you can also follow the instructions given in a related bug: Bug #35942