When trying to hybernate, my Dell Xperia XPS always resumes at once. The following journalctl entry’s may give some hints, but I don’t know how to handle it.
Apr 23 22:50:58 localhost.localdomain kernel: PM: hibernation: PM: secret key is invalid
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: EC: interrupt blocked
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: PM: Preparing to enter system sleep state S4
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: EC: event blocked
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: EC: EC stopped
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: PM: Saving platform NVS memory
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: button: The lid device is not compliant to SW_LID.
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: EC: interrupt unblocked
Apr 23 22:50:58 localhost.localdomain kernel: ACPI: EC: event unblocked
Apr 23 22:50:58 localhost.localdomain kernel: PM: Cannot get swap writer
Apr 23 22:50:58 localhost.localdomain systemd-sleep[6133]: Failed to put system to sleep. System resumed again: No space left on device
Apr 23 22:50:58 localhost.localdomain kernel: PM: hibernation: hibernation exit
The No space left on device
message irritates me most. There is no partition which is full or nearly full in my system.