Same behavior. Without AC and without adapter :
michel@skeleton:~$ sudo powertop --auto-tune
modprobe cpufreq_stats failed23 mesures préalables chargées
Impossible de charger à partir du fichier 
/var/cache/powertop/saved_parameters.powertop
File will be loaded after taking minimum number of measurement(s) with battery 
only 
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask f
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask f
Devfreq not enabled
glob returned GLOB_ABORTED
Impossible de charger à partir du fichier 
/var/cache/powertop/saved_parameters.powertop
File will be loaded after taking minimum number of measurement(s) with battery 
only 
To show power estimates do 340 measurement(s) connected to battery only


Sometimes, the sleep function works... And sometimes not... Yesterday, I leave 
my computer at 0h00 (54%) and at 8h00, the battery was 0%...

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https://bugs.launchpad.net/bugs/1810619

Title:
  Sleep mode doesn't work

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On my Dell XPS 13 laptop (9370), the sleep mode dosn't work anymore with 
linux-image-4.18.0-13.
  The screen goes off correctly but any touch resume the laptop.

  This is the log :
  Jan  5 11:15:25 skeleton systemd[1]: Reached target Sleep.
  Jan  5 11:15:25 skeleton systemd[1]: Starting Suspend...
  Jan  5 11:15:25 skeleton systemd[1]: Starting Network Manager Script 
Dispatcher Service...
  Jan  5 11:15:25 skeleton systemd-sleep[6229]: Suspending system...
  Jan  5 11:15:25 skeleton kernel: [ 6176.006021] PM: suspend entry (s2idle)
  an  5 11:15:25 skeleton dbus-daemon[1051]: [system] Successfully activated 
service 'org.freedesktop.nm_dispatcher'
  Jan  5 11:15:25 skeleton systemd[1]: Started Network Manager Script 
Dispatcher Service.
  Jan  5 11:15:25 skeleton nm-dispatcher: req:1 'down' [wlp2s0]: new request (1 
scripts)
  Jan  5 11:15:25 skeleton nm-dispatcher: req:1 'down' [wlp2s0]: start running 
ordered scripts...

  [...]
  Resume :

  Jan  5 12:00:02 skeleton kernel: [ 6176.006023] PM: Syncing filesystems ... 
done.
  Jan  5 12:00:02 skeleton kernel: [ 6176.016581] Freezing user space processes 
... (elapsed 0.088 seconds) done.
  Jan  5 12:00:02 skeleton kernel: [ 6176.104653] OOM killer disabled.
  Jan  5 12:00:02 skeleton kernel: [ 6176.104654] Freezing remaining freezable 
tasks ... (elapsed 0.001 seconds) done.
  Jan  5 12:00:02 skeleton kernel: [ 6176.106070] Suspending console(s) (use 
no_console_suspend to debug)
  Jan  5 12:00:02 skeleton kernel: [ 8852.990035] OOM killer enabled.
  Jan  5 12:00:02 skeleton kernel: [ 8852.990037] Restarting tasks ... done.
  Jan  5 12:00:02 skeleton kernel: [ 8853.015639] r8152 2-1.2:1.0 
enxe4b97acfa7e9: carrier on
  Jan  5 12:00:02 skeleton kernel: [ 8853.084055] PM: suspend exit


  
  With linux-image-4.18.0-10, it works correcly (but no with 4.18.0-11 and 
4.18.0-12).
  Thanks,

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