I did some more digging and realised that this was due to a misconfigured BIOS - I'd been too aggressive in disabling hardware to save power. Once I restored it to the default setting, suspend/resume works fine - from the pm_trace logs I suspect the issue was that I'd disabled the serial port.
I'm happy for this bug to be closed, or changed to a lower priority. I'll rename it to reflect the actual bug. ** Summary changed: - Dell Latitude E7240 does not resume from suspend + Dell Latitude E7240 does not resume from suspend with non-default BIOS settings (when serial port is disabled?) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1295382 Title: Dell Latitude E7240 does not resume from suspend with non-default BIOS settings (when serial port is disabled?) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1295382/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
