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x360 spectre No S3 sleep mode (mem to ram)

hp-spectre-x360-convertible-13-ap0xxx
Linux

Hello,

 

In short: I  can not get the laptop (x360 ap0xxx) to get into S3 sleep mode.

 

In long:

laptop: hp-spectre-x360-convertible-13-ap0xxx

i78565U/16Gb/512Gb/13" touch/model 2018

BIOS:  F.27

 

I installed Linux (tried Fedora  30 and Ubuntu 19.04) as dual boot. Evrything works but sleep mode.

 

S3 sleep function is not accessible

cat /sys/power/mem_sleep
[s2idle]

 

dmesg |grep ACPI|grep S0

[ 0.371691] ACPI: (supports S0 S4 S5)

 

I suspect the issue is with BIOS/UEFI

because with another version of x360 no problems observed:

http://doc-ok.org/?p=1730

 

Similar problem was with Lenovo X1 laptop which had Si03 instead of S3. It was solved by updating BIOS

https://delta-xi.net/blog/#056

 

Any ideas/solutions?

 

 

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