[Bug 111594] [guc/huc] Deep Package C-states never reached after laptop screen is turned off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111594

--- Comment #16 from kitestramuort at autistici.org ---
i915 is compiled in, along with the required firmware.

Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[    0.264710] [drm] HuC: Loaded firmware i915/kbl_huc_ver02_00_1810.bin
(version 2.0)
[    0.276705] [drm] GuC: Loaded firmware i915/kbl_guc_32.0.3.bin (version
32.0)
[    0.284788] [drm] CT: enabled
[    0.305613] [drm] Initialized i915 1.6.0 20190619 for 0000:00:02.0 on minor
0

# turbostat --quiet --show CPU%c7,GFX%rc6,Totl%C0,Any%C0,GFX%C0 sleep 10
10.004035 sec
CPU%c7  GFX%rc6 Totl%C0 Any%C0  GFX%C0
96.69   99.06   4.74    4.13    0.32
95.04   99.06   4.74    4.13    0.32
97.03
97.29
97.41

# rtcwake -s 30 -m disk


# turbostat --quiet --show CPU%c7,GFX%rc6,Totl%C0,Any%C0,GFX%C0 sleep 10
10.002372 sec
CPU%c7  GFX%rc6 Totl%C0 Any%C0  GFX%C0
96.35   5.20    7.43    6.78    80.83
91.77   5.20    7.43    6.78    80.83
99.09
96.83
97.71

The dreadful 5.20...
After that...
# turbostat --show Pkg%pc8
Pkg%pc8
0.00
0.00

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