[Bug 111047] On IceLake machine GPU can't enter DC6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111047

--- Comment #1 from Cooper Chiou <cooper.chiou at intel.com> ---
>From drm log, I can see DC6 is enabled.

Jul  3 16:01:45 u-xxxx kernel: [   17.967382] [drm:edp_panel_vdd_off_sync
[i915]] Turning eDP port A VDD off
Jul  3 16:01:45 u-xxxx kernel: [   17.967519] [drm:edp_panel_vdd_off_sync
[i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000067
Jul  3 16:01:45 u-xxxx kernel: [   17.967563] [drm:intel_power_well_disable
[i915]] disabling DC off
Jul  3 16:01:45 u-xxxx kernel: [   17.967610] [drm:skl_enable_dc6 [i915]]
Enabling DC6
Jul  3 16:01:45 u-xxxx kernel: [   17.967650] [drm:gen9_set_dc_state [i915]]
Setting DC state from 00 to 02

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