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please help me, i have problem with the suspend. what ever i do to suspend via close lid or klik suspend button it running well at first. but the second suspend my laptop can't suspend properly, it just turn the lid black but my laptop isn't turn to suspend. please help me.

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I am also facing the same issue. I have a Dell Inspiron 15R 5521.

This is a known bug in 16.04. You can follow the developments here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566302.

Edit: Apparently there is a bug in the 4.4.0 kernel. The problem can be solved when you install the new kernel 4.4.8.

You can find instruction to do it here: http://linuxdaddy.com/blog/install-kernel-4-4-on-ubuntu/