Comment 501 for bug 59695

Also, more on laptop-mode. In config file comments I've seen that it is disabled by default (and it seems devs tried to make it not so obvious how to really enable it), because it causes odd hangs on some computers. What sort of hangs are we dealing with? If this was about hangs when watching a movie, then the right answer would be not setting LM_READAHEAD to 3072 by default. It'd be a shame if laptop-mode was so hard-codedly disabled because of readahead problem. :-/