I found that this bug related to rtl8187 wireless chip behaviour: 
https://bugs.launchpad.net/bugs/279798
I partially solved the problem by applying this workaround: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/279798/comments/14 
introduced by Hélio Nunes and making this file executable with sudo chmod +x. 
Now suspend and hibernate work with expected 5 s delay.

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[TOSHIBA Satellite L40] hibernate/resume failure
https://bugs.launchpad.net/bugs/335361
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