Are there user settings in the laptop policy. If there are only laptops in that OU then the user settings would not apply to any GPOs linked at that level.
If you want user settings applied to machines like that you would need to use loopback processing. (generally done for kiosk or terminal server boxes)
Good loopback overview here:
http://sdmsoftware.com/blog/2009/01/06/please-explain-loopback-processing/Thanks
Mike