few kms tests - dmesg-warn/demsg-fail - *ERROR* Timeout waiting for DDI BUF C to get idle
<7> [404.138340] xe 0000:03:00.0: [drm:intel_disable_transcoder [xe]] disabling pipe A
<7> [404.156430] xe 0000:03:00.0: [drm:intel_power_well_disable [xe]] disabling AUX_C
<7> [404.159144] xe 0000:03:00.0: [drm:intel_power_well_disable [xe]] disabling DDI_IO_B
<7> [404.159486] xe 0000:03:00.0: [drm:__intel_fbc_disable [xe]] Disabling FBC on [PLANE:31:plane 1A]
<7> [404.160365] xe 0000:03:00.0: [drm:intel_disable_transcoder [xe]] disabling pipe B
<3> [404.180587] xe 0000:03:00.0: [drm] *ERROR* Timeout waiting for DDI BUF C to get idle
<7> [404.180610] xe 0000:03:00.0: [drm:intel_power_well_disable [xe]] disabling DDI_IO_C
<7> [404.180958] xe 0000:03:00.0: [drm:intel_cdclk_dump_config [xe]] Changing CDCLK to 163200 kHz, VCO 1305600 kHz, ref 38400 kHz, bypass 19200 kHz, voltage level 0
<7> [404.181250] xe 0000:03:00.0: [drm:intel_set_cdclk [xe]] aud_ts_cdclk set to M=60, N=408
<7> [404.181570] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:235:DDI A/PHY A]
<7> [404.181802] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:237:DP-MST A]
<7> [404.182020] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:238:DP-MST B]
<7> [404.182230] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:239:DP-MST C]
<7> [404.182460] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:240:DP-MST D]
<7> [404.182655] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:254:DDI B/PHY B]
<7> [404.182852] xe 0000:03:00.0: [drm:intel_modeset_verify_disabled [xe]] [ENCODER:258:DDI C/PHY C]