Comment 19 for bug 1290337

@Christopher. Sorry, can't answer that question: i never run anything earlier than quantal on this hardware. On the previous laptop (thinkpad w500) where i run many earlier versions of ubuntu (including quantal for a few weeks) i did not notice that problem but then that laptop did have only 8GB of RAM (compared to the 16GB of the w530) on this one and as mentioned in problem description (and also as mentioned in bug 1107150) the problem seems to appear only as you get more allocated RAM. E.g., after the initial test with 3.15-rc5 and the relative quick arise of the problem, i booted with mem=15000M (resulting in 14362796 total mem instead of 16xxxxxx) and so far i've seen the problem less and could (at least temporarily) resolve it using the sysctl drop_caches hack (something which did not work anymore for the previous run with all RAM enabled)