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I have a ASUS laptop: Model: X553M Processor: Intel Pentium Quad-Core N3540 with Intel HD graphics RAM: 4GB 1600MHz OS: Ubuntu 15.10 AMD64 Since the beginning of this week it started freezing after period of times. I had installed Ubuntu 14.04.3, it updated to 14.04.4 and installed latest Enablement Stack on it and now I installed 15.10 and it still freezing. The freeze consist in everything stops working, cannot turn to console mode (ALT + F keys), ALT + SYSRQ + REISUB no response, power led on, only force stop works.
I have installed Intel graphics installed to be sure I have latest Intel graphic driver, HDD has no bad sectors, Memtest86 passed, cannot find any crash logs.
My father uses this laptop and he uses it only for web browsing, he said it randomly froze when he was online. For me I gave it a test and what I've done is I opened Firefox with 5 tabs all with youtube videos running simultaneous and it froze 2 times in an hour, until this test OS install + updates + software installs/replacements I had no issue with it (let's say a total of 2 hours), it worked flawlessly.
Can someone help me find the cause of it so I can remove it?
This is not a duplicate of the question: System freezes completely with Intel Bay Trail, it is other way around and this question has been answered and the answer was marked accordingly.