I encountered the issue again after upgrading to the the latest upstream kernel[0]. After booting with the new kernel version, I verified outputs from `uname` (all as expected) and `dmesg | egrep -i 'error|critical|failed'` (as expected) and then closed my laptop lid while it was connected to AC power. It remained connected to AC power until approximately 4:35, at which point I removed the AC power and placed the laptop in my backpack without opening the lid. At about 5:45, I opened my laptop's lid while on battery power and encountered the same problem as before. I tried all possible orders of "closing the lid", "connecting AC power" and "reopening the lid" but none worked, so I powered off my laptop using the power-button and booted it to find ubuntu in the same state as it was when I last used it. Then, after about 30 minutes of use, I repeated that process EXCEPT that I connected my laptop to AC power BEFORE opening the lid, and this time I did not experience any issues with resuming. I checked the output of dmesg piped to egrep (same command I mentioned earlier) and there appear to be some new messages. I have attached the new output of that command with this comment. Only the first 3 lines (false-positives from 'errors=' flag on mount) were logged last night when I checked. The rest are new and I am fairly certain that the first 2 'rebind failed' entries were logged at about the time that I removed AC power from my laptop the first time (~4:35pm). I hope that some of this information is useful to you.
[0] https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.tar.xz ** Attachment added: "Output of command: dmesg | egrep -i 'error|critical|failed'" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1649048/+attachment/4791808/+files/dmesg_2016-12-14.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1649048 Title: "Power off" required for resume from hybrid-sleep on AC power To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1649048/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
