Comment 6 for bug 1402767

One year wiht LM 17.2/17.3, no problem at all. Upgrading to LM 18 from 17.3 las december, with errors, so fresh install of LM 18 => got this problem, upgrading to LM 18.1 did not solve it.

Some boots (after introducing user pass) lead to black screen, CPU 100% (fan running), high disk activity (SSD) during ~5 min, then Cinnamon crashes in fallback mode. After manual shutdown, maybe the next boot is OK or not, sometimes I can have 3 or 4 fallback boots in a row, then I can have also 3 or 4 good boots.

Trying the workaround mentioned by John Burt (n9dvm) works: enabling timed login 10s leads to no crashes at all in two days (10 boots). But I cannot have timed login, disabling it leads to crashes again. The worst is that 'manual timed login' (waiting 10s or 20s in normal login after introducing password) does NOT solve the problem: the crashes may arise again.

It is a very annoying bug, because I cannot reliably boot my machine... last resort I have is giving up LM/Cinnamon.