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After some updates to the kernel, my laptop doesn't resume anymore if it's not connected to a power source. If I plug in the AC and then suspend, it will resume.

I thought that this was related to TLP and power management, but even disabling TLP doesn't make it resume on battery. In journal I just see:

Jun 23 08:19:01 miki-laptop systemd-logind[395]: Lid closed.

Jun 23 08:19:14 miki-laptop systemd-logind[395]: Suspending...

Jun 23 08:19:15 miki-laptop systemd[1]: Starting Lock X session using xlock...

Jun 23 08:19:15 miki-laptop systemd[1]: Starting TLP suspend/resume...

Jun 23 08:19:15 miki-laptop systemd[1]: Started TLP suspend/resume.

Jun 23 08:19:15 miki-laptop lock.sh[1107]: real        0m0.730s

Jun 23 08:19:15 miki-laptop lock.sh[1107]: user        0m0.690s

Jun 23 08:19:15 miki-laptop lock.sh[1107]: sys        0m0.017s

Jun 23 08:19:16 miki-laptop lock.sh[1107]: real        0m0.915s

Jun 23 08:19:16 miki-laptop lock.sh[1107]: user        0m0.857s

Jun 23 08:19:16 miki-laptop lock.sh[1107]: sys        0m0.030s

Jun 23 08:19:17 miki-laptop lock.sh[1107]: real        0m0.681s

Jun 23 08:19:17 miki-laptop lock.sh[1107]: user        0m0.767s

Jun 23 08:19:17 miki-laptop lock.sh[1107]: sys        0m0.010s

Jun 23 08:19:17 miki-laptop systemd[1]: Started Lock X session using xlock.

Jun 23 08:19:17 miki-laptop systemd[1]: Reached target Sleep.

Jun 23 08:19:17 miki-laptop systemd[1]: Starting Suspend...

-- Reboot --

The reboot is when I resume, so I don't really know if the problem lies in the suspend or in the resume. My laptop is an Asus UX305UA, and the problem is very similar to this other question:
Asus UX303UA rebooting instead of resuming from suspend (ubuntu 15.10)

It's actually a Kernel Bug, see Kernel Bugtracker here:
https://bugzilla.kernel.org/show_bug.cgi?id=108801

Looking into the BIOS options, I found "Wake on lid open". Even if it says "Enabled" it does not always work.

I found that when I upgrade the kernel, I have to go into the BIOS, select "Disabled", reboot, go into the BIOS again and select "Enabled".

Amazingly, with this process the laptop wakes from suspend on battery as well.

I had similar problem. Everything was fine but suddenly, when I suspended my laptop (buy closing the lid or via menu), it was going to sleep mode with led blinking, but when I woke the laptop, it restarted as it was shutdown.

Laptop ASUS ZenBook UX305



Linux 4.13.0-38-generic #43~16.04.1-Ubuntu SMP x86_64

I tried many things, and no result, but one time I switch to TTY1 with Ctrl+Alt+F1 and logged in, and exited. After that it is working again.

Also I set the following setting in "sudo vim /etc/default/grub" :

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_sleep=nonvs intel_pstate=disable"

but it was not working before TTY1.

The things that was changing before the problem was :

• I forgot my charger, and I used a different charger, the original is
  19 volts but the one I used was 20 volts.


• One time the laptop hanged during suspend process, so I did hard
  restart by pressing and holding the power button.


• Recently, I updated the system with "Software Updater"

I thought it might help some one.

I had the same problem with my UX305. The problem seems to be a problem of the ASUS BIOS not a kernel bug. The problem appears in Linux and in Windows.
There is at the moment no fixed BIOS available.
But the "solution"/workaround is to shutdown the UX305 (not reboot, only a clean shutdown and afterwards a new startup). After that resuming will work properly.