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the title says almost everything.

If i suspend my ubuntu 12.04 on a compaq 615 laptop, on wake up everthing works perfectly apart from the fact that the fans don't wake up, cpu heats and upon reaching 90°C somehow triggers the fans to start. (idles at around 59°C).

Any ideas?

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This sounds like a hardware issue. Try a live boot and see if the same thing occurs. If it does, you might want to consider taking the computer to get repaired. – Switchkick May 16 '12 at 13:26
Check for a bios update – psusi May 16 '12 at 15:02

The problem might be with your laptop because I have seen many cases where it becomes difficult to gain back your session after 'suspending' from terminal. Try cleaning your fans for one thing.

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They are crystal clean and work perfectly when booting+shutting down. – sdrubish May 16 '12 at 15:24

This probably isn't the answer you're looking for, but you could try using a 3.5.0 kernel.

I had a similar experience to you when using 3.19.0 kernels on as Asus X453M laptop, but no such problem when using 3.5.0 kernels.

(Unfortunately I would really prefer a 3.19 kernel, because it allows me to get two-finger scrolling which I can't get with the earlier kernel.)

How to

$ apt-cache search linux-image-3.5

$ sudo apt-get install linux-image-3.5.0-54-generic     # or whatever

When your machine reboots, you will need to go to Ubuntu (Advanced) and arrow-down to reach the 3.5.0 kernel.

If the older kernel satisfied you, you could make grub select it automatically.

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Update: I have not been having this issue since I installed the kernel linux-image-4.4.0-14-lowlatency – joeytwiddle Apr 9 at 13:51

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