few kms tests - dmesg-warn - *ERROR* CPU pipe .* FIFO underrun
<7> [158.240833] i915 0000:00:02.0: [drm:intel_dp_program_link_training_pattern [i915]] [CONNECTOR:115:DP-1][ENCODER:114:DDI B/PHY B][DPRX] Using DP training pattern TPS1
<7> [158.278027] i915 0000:00:02.0: [drm:intel_dp_link_train_phy [i915]] [CONNECTOR:115:DP-1][ENCODER:114:DDI B/PHY B][DPRX] Clock recovery OK
<7> [158.278665] i915 0000:00:02.0: [drm:intel_dp_program_link_training_pattern [i915]] [CONNECTOR:115:DP-1][ENCODER:114:DDI B/PHY B][DPRX] Using DP training pattern TPS3
<7> [158.315850] i915 0000:00:02.0: [drm:intel_dp_link_train_phy [i915]] [CONNECTOR:115:DP-1][ENCODER:114:DDI B/PHY B][DPRX] Channel EQ done. DP Training successful
<7> [158.316605] i915 0000:00:02.0: [drm:intel_dp_link_train_phy [i915]] [CONNECTOR:115:DP-1][ENCODER:114:DDI B/PHY B][DPRX] Link Training passed at link rate = 270000, lane count = 4
<7> [158.357182] i915 0000:00:02.0: [drm:lspcon_write_infoframe [i915]] AVI IF handled by FW
<7> [158.358049] i915 0000:00:02.0: [drm:intel_enable_transcoder [i915]] enabling pipe A
<3> [158.359522] i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
<7> [158.376370] i915 0000:00:02.0: [drm:intel_audio_codec_enable [i915]] [CONNECTOR:115:DP-1][ENCODER:114:DDI B/PHY B] Enable audio codec on [CRTC:61:pipe A], 36 bytes ELD
<7> [158.408024] i915 0000:00:02.0: [drm:verify_connector_state [i915]] [CONNECTOR:115:DP-1]
<7> [158.409399] i915 0000:00:02.0: [drm:intel_modeset_verify_crtc [i915]] [CRTC:61:pipe A]
<7> [158.420081] i915 0000:00:02.0: [drm:drm_mode_setcrtc] [CRTC:91:pipe B]
<7> [158.426039] i915 0000:00:02.0: [drm:drm_mode_setcrtc] [CRTC:113:pipe C]
<7> [158.479171] i915 0000:00:02.0: [drm:i915_fifo_underrun_reset_write [i915]] Re-arming FIFO underruns on pipe A
<7> [158.481950] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:138]
<7> [158.591580] i915 0000:00:02.0: [drm:intel_pipe_config_compare [i915]] [CRTC:61:pipe A] fastset requirement not met in hw.enable (expected yes, found no)
<7> [158.592165] i915 0000:00:02.0: [drm:intel_pipe_config_compare [i915]] [CRTC:61:pipe A] fastset requirement not met in hw.active (expected yes, found no)
<7> [158.592819] i915 0000:00:02.0: [drm:intel_pipe_config_compare [i915]] [CRTC:61:pipe A] fastset requirement not met in cpu_transcoder (expected 0, found -1)
<7> [158.593460] i915 0000:00:02.0: [drm:intel_pipe_config_compare [i915]] [CRTC:61:pipe A] fastset requirement not met in lane_count (expected 4, found 0)