Do not autoselect the DRM method

Signed-off-by: Mattias Andrée <maandree@operamail.com>
Bug fix for when we cannot get gamma ramp information

Signed-off-by: Mattias Andrée <maandree@operamail.com>
Merge updates to gamma-drm branch and resolve merge conflicts

Signed-off-by: Mattias Andrée <maandree@operamail.com>