Before system tried to select optimal display mode by sequential scan of modes and if error then stop scanning. This way is not good, because if mode N is not present, mode N+1 may exist. In loader we use conout->Mode->MaxMode to identify maximum number of mode. This proposal is to use same way in boot1 as in loader.
Tested on Dell inspiron 5537.
Also it solves issue with VT for this laptop: https://twitter.com/michael_zhilin/status/934098353352249345