By git bisect on linux-stable kernel tree I got to commit 0c8b7991f40d
ata: libahci: Correct setting of DEVSLP register
This suggested future research and I realized, that laptop-mode-tools
sets drivers to lowest power mode which has setting
BATT_SATA_POLICY=min_power
in /etc/laptop-mode/conf.d/intel-sata-powermgmt.conf
Above mentioned commit enables DEVSLP in this mode. Moreover this
kernel has 'med_power_with_dipm' setting which is near 'min_power' but
without DEVSLP.
--
Tomáš 'ebík' Ebenlendr
PF 2018.85211022324
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