There is a problem with s2ram on 4.16, and it has now been propagated to 4.15 and 4.14 stable updates.
It originates from commit 62c00e6122a6b5aa7b1350023967a2d7a12b54c9 Author: William Grant <william.gr...@canonical.com <mailto:william.gr...@canonical.com>> Date: Tue Jan 30 22:22:55 2018 +1100 x86/mm: Fix overlap of i386 CPU_ENTRY_AREA with FIX_BTMAP s2ram works OK on PAE kernels, breaks badly on non-PAE. I do not think that the problem can be duplicated in VMPlayer, but it is 100% reproducible on a "real" hardware. System goes to sleep OK, but when woken - it reboots the PC. The issue is tracked in Bugzilla bug 198763 [https://bugzilla.kernel.org/show_bug.cgi?id=198763] Thanks, Woody
