After we infer the aspect ratio for the screen, we pick the largest
mode matching that aspect ratio from the best mode pool available.
We then clamp virtual size to that mode, and run the resulting mode
list through the driver's ValidMode hook. In doing so we might filter
away our initial guess. If this happens we shrink the default mode
to the next largest mode from _any_ mode pool. This is usually wrong,
and we should instead pick the next aspect-matched mode from the best
available mode pool (as always, user then driver then default).
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
7bb653bedc