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
Also, this issue appears to be an upstream bug, since you tested the
latest upstream kernel. Would it be possible for you to open an upstream
bug report[0]? That will allow the upstream Developers to examine the
issue, and may provide a quicker resolution to the bug.
Please follow the instructions
Was there ever a prior release or kernel that did not experience this
issue?
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Tags added: kernel-bug-exists-upstream
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