[HSW] *ERROR* uncleared fifo underrun on pipe , *ERROR* CPU pipe .* FIFO underrun|*ERROR* uncleared fifo underrun on pipe [ABCD]

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_922/fi-hsw-gt1/igt@kms_panel_fitting@legacy.html

<3> [526.050724] i915 0000:00:02.0: [drm] *ERROR* uncleared fifo underrun on pipe B
<3> [526.050874] i915 0000:00:02.0: [drm] *ERROR* CPU pipe B FIFO underrun
<7> [526.060642] i915 0000:00:02.0: [drm:verify_connector_state [i915]] [CONNECTOR:77:eDP-1]
<7> [526.061190] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [CRTC:60:pipe B]
<7> [526.061561] i915 0000:00:02.0: [drm:verify_single_dpll_state.isra.94 [i915]] LCPLL 1350
<7> [526.062650] i915 0000:00:02.0: [drm:drm_mode_rmfb_work_fn] Removing [FB:105] from all active usage due to RMFB ioctl
<7> [526.062696] i915 0000:00:02.0: [drm:atomic_remove_fb] Disabling [PLANE:46:primary B] because [FB:105] is removed
<7> [526.074135] [drm:drm_mode_addfb2] [FB:105]
<7> [526.117043] [drm:drm_mode_setcrtc] [CRTC:60:pipe B]
<7> [526.117095] [drm:drm_mode_setcrtc] [CONNECTOR:77:eDP-1]
<7> [526.117237] i915 0000:00:02.0: [drm:intel_atomic_check [i915]] [CONNECTOR:77:eDP-1] Limiting display bpp to 18 instead of EDID bpp 18, requested bpp 36, max platform bpp 36
<7> [526.117463] i915 0000:00:02.0: [drm:intel_dp_compute_config [i915]] DP link computation with max lane count 2 max rate 270000 max bpp 18 pixel clock 214000KHz
<7> [526.117664] i915 0000:00:02.0: [drm:intel_dp_compute_config [i915]] Force DSC en = 0
<7> [526.117863] i915 0000:00:02.0: [drm:intel_dp_compute_config [i915]] DP lane count 2 clock 270000 bpp 18
<7> [526.118541] i915 0000:00:02.0: [drm:intel_dp_compute_config [i915]] DP link rate required 481500 available 540000
<7> [526.118759] i915 0000:00:02.0: [drm:intel_atomic_check [i915]] hw max bpp: 18, pipe bpp: 18, dithering: 1
<7> [526.119228] i915 0000:00:02.0: [drm:intel_ddi_compute_config_late [i915]] [ENCODER:76:DDI A/PHY A] [CRTC:60:pipe B]
<7> [526.119511] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] [CRTC:60:pipe B] enable: yes [fastset]
<7> [526.119720] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] active: yes, output_types: EDP (0x100), output format: RGB
<7> [526.120207] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] cpu_transcoder: EDP, pipe bpp: 18, dithering: 1
<7> [526.120414] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] MST master transcoder: <invalid>
<7> [526.120618] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] port sync: master transcoder: <invalid>, slave transcoder bitmask = 0x0
<7> [526.121622] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] bigjoiner: no
<7> [526.122315] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] splitter: disabled, link count 0, overlap 0
<7> [526.122524] i915 0000:00:02.0: [drm:intel_dump_m_n_config.isra.64 [i915]] dp m_n: lanes: 2; gmch_m: 7479842, gmch_n: 8388608, link_m: 415546, link_n: 524288, tu: 64
<7> [526.122732] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] audio: 0, infoframes: 0, infoframes enabled: 0x0
<7> [526.123322] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] vrr: no, vmin: 0, vmax: 0, pipeline full: 0, guardband: 0 flipline: 0, vmin vblank: -1, vmax vblank: -2
<7> [526.123531] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] requested mode:
<7> [526.123847] [drm:drm_mode_debug_printmodeline] Modeline "1920x1080": 90 214000 1920 1936 1952 2104 1080 1083 1097 1128 0x48 0xa
<7> [526.123859] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] adjusted mode:
<7> [526.124321] [drm:drm_mode_debug_printmodeline] Modeline "1920x1080": 90 214000 1920 1936 1952 2104 1080 1083 1097 1128 0x48 0xa
<7> [526.124334] i915 0000:00:02.0: [drm:intel_dump_crtc_timings [i915]] crtc timings: 214000 1920 1936 1952 2104 1080 1083 1097 1128, type: 0x48 flags: 0xa
<7> [526.124545] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] pipe mode:
<7> [526.124757] [drm:drm_mode_debug_printmodeline] Modeline "1920x1080": 90 214000 1920 1936 1952 2104 1080 1083 1097 1128 0x40 0xa
<7> [526.124767] i915 0000:00:02.0: [drm:intel_dump_crtc_timings [i915]] crtc timings: 214000 1920 1936 1952 2104 1080 1083 1097 1128, type: 0x40 flags: 0xa
<7> [526.125258] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] port clock: 270000, pipe src size: 1920x1080, pixel rate 214000
<7> [526.125466] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] linetime: 79, ips linetime: 0
<7> [526.125674] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] pch pfit: 0x0+0+0, disabled, force thru: no
<7> [526.126178] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] ips: 0, double wide: 0
<7> [526.126382] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] dpll_hw_state: wrpll: 0x0 spll: 0x0
<7> [526.126589] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] csc_mode: 0x2 gamma_mode: 0x0 gamma_enable: 0 csc_enable: 0
<7> [526.127611] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] degamma lut: 0 entries, gamma lut: 0 entries
<7> [526.127820] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] [PLANE:46:primary B] fb: [FB:105] 1920x1080 format = XR24 little-endian (0x34325258) modifier = 0x0, visible: yes
<7> [526.128374] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] 	rotation: 0x1, scaler: -1
<7> [526.128581] i915 0000:00:02.0: [drm:intel_dump_pipe_config [i915]] 	src: 1920.000000x1080.000000+0.000000+0.000000 dst: 1920x1080+0+0
<7> [526.134266] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [ENCODER:76:DDI A/PHY A]
<7> [526.134490] i915 0000:00:02.0: [drm:intel_atomic_commit_tail [i915]] [ENCODER:83:DDI B/PHY B]