As you suggested BIOS F.39 solves the volume control issue (was not working 
from keyboard);

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
F.39
05/26/2015

It still is freezing though.
I do intend to try the newer kernel as soon as I can find some time for that.
Any other ideas how solve this issue?
I mean of the next kernel shows this too...then?
How bad are these hangs for the File-Sytems? Any suggestions about soft way to 
recover from the hangs?

Thanks

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https://bugs.launchpad.net/bugs/1514233

Title:
  Ubuntu 15.10 freezes during operation.

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