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Dell xps 15 9550 doesn't wake up, after hibernation

Hi everyone, I have an xps 15 512 ssd and 4k display and i7 processor with ubuntu-16.04, from a couple of week, when I try to hibernate the pc and after I try to reopen it, the pc doesn't wake up. And I have to shutdown using power button. I have the last bios version, and 4.4-38 generic kernel version. Thanks.
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