I tried to get more information by following https://wiki.ubuntu.com/DebuggingKernelSuspend
The resume failure happens regardless of which suspend method I use: shutting lid, click suspend in gui, pm-suspend Regarding booting into the latest mainline kernel: Should I really use the latest (v4.2-rc8-unstable) or the latest for my version of Ubuntu (v3.15-rc2-trusty)? I tried the "resume-trace" debugging procedure, but I'm not sure, it gave a usable result: grep -i -A 3 -B 3 "hash matches" dmesg.txt [ 1.308444] IMA: No TPM chip found, activating TPM-bypass! [ 1.308961] regulator-dummy: disabling [ 1.309142] Magic number: 11:791:774 [ 1.309197] mem zero: hash matches [ 1.309346] rtc_cmos 00:05: setting system clock to 2015-08-24 07:46:28 UTC (1440402388) [ 1.310770] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found [ 1.310771] EDD information not available. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1487993 Title: [Dell Latitude E6410] Suspend/Resume failure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1487993/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
