Bug#418377: Don't automatically set highest possible resolution as default

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

Paul van der Vlis wrote:
> Normally you use something conservative in such cases. Wy not make a
> default of maximum 1280x1024?
>   

I am not sure it will be enough on old hardware, and Debian runs on lots
of old machines. The driver is already involved in the computation of
the default resolution, maybe some drivers just need to be more restrictive.

Brice