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I'm using Intel's S0ixSelftestTool (https://github.com/intel/S0ixSelftestTool/)
as I was getting seemingly high battery drain in sleep. According to the logs,
it can get the CPU into PC10 state, but the logs state:

"Your system supports S0ix substates, but did not achieve the shallowest
s0i2.0"

I have tried "powertop --calibrate" and "powertop --auto-tune", but the s0
self-etst logs still look the same

Reproducible: Always

Steps to Reproduce:
1. Run "s0ix-selftest-tool.sh -s"
2. Check for s0 residency
Actual Results:  
CPU Core C7 residency after S2idle is: 98.34
GFX RC6 residency after S2idle is: 
CPU Package C-state 2 residency after S2idle is: 2.79
CPU Package C-state 3 residency after S2idle is: 2.26
CPU Package C-state 8 residency after S2idle is: 0.21
CPU Package C-state 9 residency after S2idle is: 1.33
CPU Package C-state 10 residency after S2idle is: 88.21
S0ix residency after S2idle is: 0.00

Your system supports S0ix substates, but did not achieve the shallowest s0i2.0

Here is the S0ix substates status: 
Substate   Residency      
S0i2.0     0              
S0i3.0     0      

(...)

Did not detect the potential blockers from substate_requirements,     
need to check substate_status_registers file for the advanced debug.

(...)

Your system south port controller power gating state is OK after 30 seconds
runtime check.



Expected Results:  
Residency in one of the s0 states