[PATCH] modesetting: port clean start code from amdgpu.

[Eric Anholt]

Dave Airlie <airlied at gmail.com> writes:

> From: Dave Airlie <airlied at redhat.com>
>
> Both radeon and amdgpu don't set the mode until the first blockhandler,
> this means everything should be rendered on the screen correctly by then.
>
> This ports this code, it also removes the tail call of EnterVT from
> ScreenInit, it really isn't necessary and causes us to set a dirty
> mode with -modesetting always anyways.

This seems like a really nice feature to have, and the implementation
is simple enough.

Reviewed-by: Eric Anholt <eric at anholt.net>
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