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

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