[[Ubuntu does not provide an update path for (these) Lenovo BIOS. Maybe
it would be nice to have a solution for this as well, to avoid users
being bound to buggy and outdated BIOS. To add, the given instructions
to the wiki seem very abandonned and do not (not all) apply to nowadays
ROMs of >10MB. Figuring that out cost me a day. ]]

After installing the Win8/BIOS, the problem still occurs.
  sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
  76CN43WW
  03/30/2015

When I intentionally launch so many applications to trigger the freezes, I 
noticed that `top` displays actually different numbers:
  KiB Mem:  8085948 total, 8023384 used,   62564 free,    3564 buffers
  KiB Swap:       0 total,       0 used,       0 free. 2976336 cached Mem
The before mentioned numbers were from Gnome system monitor (oh!), which always 
displays only 5GB / 65% of RAM. This time had also top opened before the freeze.
Do I interprete it right that under these conditions the memory is indeed full 
and that system monitor displays (used‒cached) ?

The laptop was still frozen about 10min until the Kernel decided (or was
able to) kill processes and became repsonsive again. On a second test,
it didn't become responsive even after 20min.

So concluding,
• there could be a bug in system monitor to display (used ‒ cached) RAM
• I still don't know what it is doing within these 10 – ∞ minutes. I still 
think the Kernel should be able to start killing processes (earlier), or there 
should be warnings that can take effect before the computer becomes 
unresponsive. 

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1476211

Title:
  kswapd takes 100% CPU although there is no swap

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