>I have heard of similar issues if we switch 
>/sys/class/scsi_host/*/link_power_management_policy  between min_power and 
>max_performance, but I'm not doing that.


>Is the DSDT doing something behind our back, when we plug/unplug AC power ?

You might not be doing it manually but there are power management services (at 
least in KDE) that change to min_power when you unplug the AC adapter, I would 
check if you have one of those and try setting the power profile not to switch 
to min_power.



      
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