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
No, I've never had this working.
I'm happy to report it upstream - I'll do so in the next few days.
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https://bugs.launchpad.net/bugs/1295382
Title:
Dell Latitude E7240 does not resume
Public bug reported:
Seen with 14.04 beta 1 (Trusty).
When I suspend my Dell Latitude E7240 laptop (either by closing the lid,
running pm-suspend or selecting Sleep from the KDE menu) it suspends
successfully and the power LED flashes. When I try and resume it (either
by opening the laptop or by
