I have an Acer Aspire V5 Notebook with Ubuntu 14.04 installed on a SSD an Windows 8.1 on a HDD.
I experience that my Notebook wakes up from standby randomly after a certain time (can be a few seconds, minutes or some 10 hours). This only happens in Ubuntu, Windows 8.1 is not affected. I cannot find a pattern under which situations the hibernation is interrupted. It happens if the hibernate/standby is induced by closing the lid or using the software button for standby.
Another issue which might be related is that i cannot select "hibernate" as the low battery action in the power section. It is greyed out. I am not sure if this has anything to do with my problem, I just wanted to mention it in case there is a connection.
This behaviour is potentially dangerous for the hardware: when I carry my notebook in a bag and it turns itself on, it can cause heat accumulation in the bag and the device might get damaged from overheating.
As the wake up does not always appear (in 80% percent of all standby phases, I would guess) the debugging is non trivial.
Output of uname -a:
Linux LappII 3.16.0-43-generic #58~14.04.1-Ubuntu SMP Mon Jun 22 10:21:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
EDIT: This behaviour might be related to this bug: Launchpad
I changed all entries in /etc/acpi/wakeup to disabled but this had no effect.