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I have a Dell Inspiron 1525 laptop, about three years of age. Usually I suspend it (put into sleep) in the evening and resume in the morning. Recently the laptop started turning on by itself during the night — not to mention that this always happens at about the same time!
The internet (e.g., this question) mainly suggests turning off Wake-On-LAN for the Ethernet card (I've long had it disabled through ethtool
, let alone that there's no cable plugged in), or inspecting scheduled tasks. But I use GNU/Linux (kernel version 3.1.7, x86-64 arch), so the second option also doesn't seem plausible. The BIOS is at the latest version. I've checked the package manager logs and there were no suspicious/interesting changes during the period when this started happening.
Having spent some time looking into the problem online, I dare not ask for a ready solution, but for at least a suggestion of what could be wrong, and if this is likely to be a software or a harware problem. I imagine that it could be due to dust or partially broken/bent wires causing a short circuit and a pulse somewhere on the power button or other reset lines; but a software problem seems possible as well.
UPDATE: Thanks for the suggestions. Some additional info:
dmesg
has no suspicious lines- The BIOS does not have (or show) any resume-on-alarm settings
This does not sounds like a problem to me, more like a feature gone rouge. Not sure how to track it down though. – soandos – 2012-01-08T09:34:41.727
1I've seen pcs/laptops do his due to static electricity and noise bursts in the power lines – stijn – 2012-01-08T09:45:25.847
1For the record, my laptop turns ON on its own because of a setting that makes it go from sleep to hibernation after X hours of sleep. Creepy when it wakes you up. Probably not your problem, though, since it would be still asleep/hibernating afterwards. – Joanis – 2012-01-08T12:24:18.020
Maybe look through the kernel logs and see how the computer is woken up? – billc.cn – 2012-01-08T14:08:25.780
Hi it is strange, I have a HP desktop computer with Win7 and it also sometimes resumes from hibernation just few seconds after shutting down or sometimes without any reason during the day or night when I am not in the office. I noticed this after some OS update, after another one this problem vanished but after another update it is here again. Funny... – Juhele – 2012-01-08T16:15:23.617