Enter suspend by 'systemctl suspend' in suspend.sh (Bugfix)

[LiaoU3]

Description

systemctl suspend is the way that user enter suspend mode regularly. Besides, this is also to align with suspend/suspend_advanced_auto
Moreover, with this change, some devices that does not support enter suspend via rtc can now run suspend-cycles-stress-test.

Resolved issues

1. To enter suspend as the way that regular user does.
2. Fix the default config variable from rtc0 to /dev/rtc0

Documentation

N/A

Tests

https://certification.canonical.com/hardware/202406-34151/submission/386064/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.18%. Comparing base (dfae162) to head (da4f796).
Report is 116 commits behind head on main.

Additional details and impacted files

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  Coverage   45.18%   45.18%           
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  Files         366      366           
  Lines       39107    39107           
  Branches     6612     6612           
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  Hits        17670    17670           
  Misses      20764    20764           
  Partials      673      673           

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[Hook25]

+1, makes sense. Makes me wonder, are there situations where rtcwake can suspend and systemctl no?

[LiaoU3]

@Hook25 I've never met the situation you describe before. I only have devices that can enter suspend by systemctl suspend, but not rtcwake