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At least one laptop blew up on resume from suspend with a black screen due to a lack of this patch. By only writing back config space that is different, we minimise the possibility of accidents like this. Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>