igt@kms_vblank@pipe-a-ts-continuation-dpms-suspend - incomplete -PM: suspend entry (deep).

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_12560/re-dg2-15/igt@kms_vblank@pipe-a-ts-continuation-dpms-suspend.html

<7> [948.578554] i915 0000:03:00.0: [drm:gen9_dbuf_slices_update [i915]] Updating dbuf slices to 0x3
<7> [948.579140] i915 0000:03:00.0: [drm:gen9_dbuf_slices_update [i915]] Updating dbuf slices to 0x1
<7> [948.579630] i915 0000:03:00.0: [drm:intel_power_well_disable [i915]] disabling PW_A
<7> [948.580110] i915 0000:03:00.0: [drm:verify_connector_state [i915]] [CONNECTOR:236:DP-1]
<7> [948.580482] i915 0000:03:00.0: [drm:intel_modeset_verify_crtc [i915]] [CRTC:80:pipe A]
<7> [948.581116] i915 0000:03:00.0: [drm:intel_power_well_disable [i915]] disabling DC_off
<7> [948.581510] i915 0000:03:00.0: [drm:gen9_enable_dc5 [i915]] Enabling DC5
<7> [948.581901] i915 0000:03:00.0: [drm:gen9_set_dc_state.part.0 [i915]] Setting DC state from 00 to 01
<6> [948.656316] PM: suspend entry (deep)
<6> [948.660632] Filesystems sync: 0.004 seconds
<6> [948.665339] Freezing user space processes