What you call a 'passport' is a travel document ... known as a re-entry permit for people with greencards that want to travel out of the us for more than 6 months, but less than 2 years.
Most people with greencards DO NOT NEED this document.
Also, just because someone gets it .. they can still have problems if they leave the US for more than 6 months.
Franco Capriotti - Senior Legal Counsel & Former Professor of Immigration Law - Capriotti International Law
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There is no such thing as a white passport. There is a reentry permit.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.