How to prevent your Linux laptop from waking up at night

Every time I put my X1 Carbon to suspend over night, it suddenly wakes up after some hours of sleeping. When it is connected to the power adapter, it just stays awake; when it is on battery, it eventually shuts down due to low power.

As described in this forum post, the reason for this strange behavior is an Intel® power setting in the X1's BIOS, which tries to put the machine to hibernate after 3 hours of suspend. As I use an encrypted harddrive in Ubuntu, hibernate is not available, so the process is interrupted and the notebook stays awake. (At least I guess that the encryption is the reason; but maybe the Intel® setting isn't compatible with Linux at all and also affects users who have not encrypted their HD.)

This is what the system log looks like:

Jan  7 00:11:14 carbon NetworkManager[821]: <info> (wlan0): cleaning up...
Jan  7 00:11:14 carbon NetworkManager[821]: <info> (wlan0): taking down device.
Jan  7 00:11:14 carbon dbus[488]: [system] Activating service name='org.freedesktop.n
m_dispatcher' (using servicehelper)
Jan  7 00:11:14 carbon dbus[488]: [system] Successfully activated service 'org.freede
sktop.nm_dispatcher'
Jan  7 00:11:14 carbon dbus[488]: [system] Activating service name='org.freedesktop.s
ystemd1' (using servicehelper)
Jan  7 00:11:14 carbon dbus[488]: [system] Successfully activated service 'org.freede
sktop.systemd1'
Jan  7 00:11:15 carbon kernel: [ 5507.757822] init: anacron main process (4953) kille
d by TERM signal
Jan  7 03:05:00 carbon kernel: [ 5507.807220] PM: Syncing filesystems ... done.
Jan  7 03:05:00 carbon kernel: [ 5507.814353] PM: Preparing system for mem sleep
Jan  7 03:05:00 carbon kernel: [ 5507.814656] Freezing user space processes ... (elap
sed 0.001 seconds) done.
Jan  7 03:05:00 carbon kernel: [ 5507.816363] Freezing remaining freezable tasks ... 
(elapsed 0.048 seconds) done.
Jan  7 03:05:00 carbon kernel: [ 5507.864491] PM: Entering mem sleep
Jan  7 03:05:00 carbon kernel: [ 5507.864562] Suspending console(s) (use no_console_s
uspend to debug)
Jan  7 03:05:00 carbon kernel: [ 5507.997388] sd 0:0:0:0: [sda] Synchronizing SCSI ca
che
Jan  7 03:05:00 carbon kernel: [ 5508.000197] sd 0:0:0:0: [sda] Stopping disk
Jan  7 03:05:00 carbon kernel: [ 5508.220963] mei_me 0000:00:16.0: H_RDY is not clear
ed 0x801A1A18
Jan  7 03:05:00 carbon kernel: [ 5509.045623] PM: suspend of devices complete after 1
179.763 msecs
Jan  7 03:05:00 carbon kernel: [ 5509.061579] PM: late suspend of devices complete af
ter 15.936 msecs
Jan  7 03:05:00 carbon kernel: [ 5509.077773] ehci-pci 0000:00:1d.0: System wakeup en
abled by ACPI
Jan  7 03:05:00 carbon kernel: [ 5509.093654] e1000e 0000:00:19.0: System wakeup enab
led by ACPI
Jan  7 03:05:00 carbon kernel: [ 5509.125628] xhci_hcd 0000:00:14.0: System wakeup en
abled by ACPI
Jan  7 03:05:00 carbon kernel: [ 5509.141835] PM: noirq suspend of devices complete a
fter 80.168 msecs
Jan  7 03:05:00 carbon kernel: [ 5509.142126] ACPI: Preparing to enter system sleep s
tate S3
Jan  7 03:05:00 carbon kernel: [ 5509.143885] PM: Saving platform NVS memory
Jan  7 03:05:00 carbon kernel: [ 5509.144546] Disabling non-boot CPUs ...
Jan  7 03:05:00 carbon kernel: [ 5509.146056] smpboot: CPU 1 is now offline
Jan  7 03:05:00 carbon kernel: [ 5509.249722] smpboot: CPU 2 is now offline
Jan  7 03:05:00 carbon kernel: [ 5509.250089] Broke affinity for irq 23
Jan  7 03:05:00 carbon kernel: [ 5509.250091] Broke affinity for irq 56
Jan  7 03:05:00 carbon kernel: [ 5509.353841] smpboot: CPU 3 is now offline
Jan  7 03:05:00 carbon kernel: [ 5509.355278] ACPI: Low-level resume complete
Jan  7 03:05:00 carbon kernel: [ 5509.355332] PM: Restoring platform NVS memory
Jan  7 03:05:00 carbon kernel: [ 5509.355842] Enabling non-boot CPUs ...
Jan  7 03:05:00 carbon kernel: [ 5509.355870] x86: Booting SMP configuration:
Jan  7 03:05:00 carbon kernel: [ 5509.355870] smpboot: Booting Node 0 Processor 1 API
C 0x1
Jan  7 03:05:00 carbon kernel: [ 5509.370096] CPU1 is up
Jan  7 03:05:00 carbon kernel: [ 5509.370111] smpboot: Booting Node 0 Processor 2 API
C 0x2
Jan  7 03:05:00 carbon kernel: [ 5509.384378] CPU2 is up
Jan  7 03:05:00 carbon kernel: [ 5509.384390] smpboot: Booting Node 0 Processor 3 API
C 0x3
Jan  7 03:05:00 carbon kernel: [ 5509.398650] CPU3 is up
Jan  7 03:05:00 carbon kernel: [ 5509.402365] ACPI: Waking up from system sleep state
 S3
Jan  7 03:05:00 carbon kernel: [ 5509.523787] xhci_hcd 0000:00:14.0: System wakeup di
sabled by ACPI
Jan  7 03:05:00 carbon kernel: [ 5509.587848] ehci-pci 0000:00:1d.0: System wakeup di
sabled by ACPI
Jan  7 03:05:00 carbon kernel: [ 5509.620121] PM: noirq resume of devices complete af
ter 141.186 msecs
Jan  7 03:05:00 carbon kernel: [ 5509.620222] PM: early resume of devices complete af
ter 0.083 msecs

As forum member lobner points out, the solution is to disable the deep-sleep option in the X1's BIOS. Here is how it's done:

BIOS Power Settings

reboot your X1
tap F12 immediately after startup to enter BIOS
hit TAB to select "App Menu"
hit ENTER to enter "Setup"
hit the RIGHT ARROW key to select the "Config"
hit the DOWN ARROW key until you get to "Power", then ENTER
hit the DOWN ARROW key until you get to "Intel (R) Rapid Start Technology"
hit ENTER to switch it to "Disabled"
finally, tap F10 to Save and Exit

Your Linux laptop will now stay asleep over night.