igt@i915_pm_rc6_residency@rc6.* - warn - WARNING: Total energy used while idle

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_481/fi-bdw-5557u/igt@i915_pm_rc6_residency@rc6-idle.html

IGT-Version: 1.25-gc100fe19f (x86_64) (Linux: 5.7.0-rc2-g95fef3b4fb9f6c-drmtip_481+ x86_64)
Starting subtest: rc6-idle
Total energy used for normal: 656.9mJ (219.0mW)
Total energy used for boost: 534.7mJ (178.2mW)
Total energy used for once: 562.0mJ (187.3mW)
Subtest rc6-idle: SUCCESS (12.229s)

Starting subtest: rc6-idle
(i915_pm_rc6_residency:1142) WARNING: Total energy used while idle: 1.5mJ
Subtest rc6-idle: SUCCESS (12.229s)