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After switching from MBR to GPT and updating grub (possibly overwriting my previous configuration, possibly unrelated, but that would be a strange coincidence) on my desktop computer I can no longer suspend my system (Ubuntu 16.04.7).

I first noticed that the "suspend" menu item is gone, and trying from the command line, sudo systemctl suspend returns Failed to suspend system via logind: Sleep verb not supported. pm-suspend does not do anything, pm-is-supported --suspend ; echo $? returns 1 (i.e. not supported).

As suggested in this answer, I checked the contents of /sys/power/disk. It reads [shutdown] reboot suspend so the solutions from there don't seem to apply here. (I also haven't found a secure boot option in my BIOS/UEFI settings but may have missed that.)

How can I fix this? It definitely used to work before.

fuenfundachtzig
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1 Answers1

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I had another look at the grub configuration and found

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"

had somehow made its way back into /etc/default/grub. After removing the acpi=off setting, sudo update-grub, and rebooting, the suspend option is back and works.

(Unrelated to this particular problem but probably useful in general for this type of problem is this guide on "Best practice to debug Linux* suspend/hibernate issues".)

fuenfundachtzig
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