igt@kms_frontbuffer_tracking@fbc-suspend - incomplete - PM: suspend entry (deep)

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_11521/shard-snb6/igt@kms_frontbuffer_tracking@fbc-suspend.html

<7> [56.959488] i915 0000:00:02.0: [drm:g4x_dp_port_enabled [i915]] No pipe for DP port B found
<7> [56.959616] i915 0000:00:02.0: [drm:g4x_dp_port_enabled [i915]] No pipe for DP port C found
<7> [56.959738] i915 0000:00:02.0: [drm:g4x_dp_port_enabled [i915]] No pipe for DP port D found
<7> [56.975118] i915 0000:00:02.0: [drm:__intel_fbc_disable [i915]] Disabling FBC on [PLANE:31:primary A]
<7> [56.975244] i915 0000:00:02.0: [drm:intel_disable_shared_dpll [i915]] disable PCH DPLL A (active 0x1, on? 1) for [CRTC:45:pipe A]
<7> [56.975378] i915 0000:00:02.0: [drm:intel_disable_shared_dpll [i915]] disabling PCH DPLL A
<7> [56.975707] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [ENCODER:62:CRT]
<7> [56.975865] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [ENCODER:63:HDMI D]
<7> [56.975988] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [ENCODER:71:DP D]
<7> [56.976154] i915 0000:00:02.0: [drm:verify_connector_state [i915]] [CONNECTOR:61:VGA-1]
<7> [56.976387] i915 0000:00:02.0: [drm:verify_single_dpll_state.isra.76 [i915]] PCH DPLL A
<7> [56.976583] i915 0000:00:02.0: [drm:verify_single_dpll_state.isra.76 [i915]] PCH DPLL B
<7> [56.976732] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [CRTC:45:pipe A]
<7> [56.976974] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling always-on
<7> [56.978414] [drm:drm_mode_setcrtc] [CRTC:60:pipe B]
<6> [57.032978] PM: suspend entry (deep)
<6> [57.034143] Filesystems sync: 0.001 seconds