igt@testdisplay - dmesg-warn - *ERROR* uncleared pch fifo underrun on pch transcoder A
<7> [207.714957] i915 0000:00:02.0: [drm:intel_enable_transcoder [i915]] enabling pipe A
<7> [207.716193] i915 0000:00:02.0: [drm:gen6_fdi_link_train [i915]] FDI_RX_IIR 0x100
<7> [207.716391] i915 0000:00:02.0: [drm:gen6_fdi_link_train [i915]] FDI train 1 done.
<7> [207.717345] i915 0000:00:02.0: [drm:gen6_fdi_link_train [i915]] FDI_RX_IIR 0x200
<7> [207.717525] i915 0000:00:02.0: [drm:gen6_fdi_link_train [i915]] FDI train 2 done.
<7> [207.717716] i915 0000:00:02.0: [drm:ilk_pch_enable [i915]] FDI train done.
<7> [207.717969] i915 0000:00:02.0: [drm:intel_enable_shared_dpll [i915]] enable PCH DPLL A (active 0x1, on? 0) for [CRTC:47:pipe A]
<7> [207.718208] i915 0000:00:02.0: [drm:intel_enable_shared_dpll [i915]] enabling PCH DPLL A
<3> [207.760048] i915 0000:00:02.0: [drm] *ERROR* uncleared pch fifo underrun on pch transcoder A
<3> [207.760115] i915 0000:00:02.0: [drm] *ERROR* PCH transcoder A FIFO underrun
<7> [207.780158] i915 0000:00:02.0: [drm:intel_audio_codec_enable [i915]] [CONNECTOR:67:HDMI-A-1][ENCODER:66:HDMI D] Enable audio codec on [CRTC:47:pipe A], 36 bytes ELD
<7> [207.800117] i915 0000:00:02.0: [drm:audio_config_hdmi_pixel_clock [i915]] HDMI audio pixel clock setting for 13500 not found, falling back to defaults
<7> [207.800488] i915 0000:00:02.0: [drm:audio_config_hdmi_pixel_clock [i915]] Configuring HDMI audio for pixel clock 25200 (0x00010000)
<7> [207.800856] i915 0000:00:02.0: [drm:verify_connector_state [i915]] [CONNECTOR:67:HDMI-A-1]
<7> [207.801178] i915 0000:00:02.0: [drm:intel_modeset_verify_crtc [i915]] [CRTC:47:pipe A]
<7> [207.803194] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:81]
<7> [207.827712] i915 0000:00:02.0: [drm:drm_mode_setcrtc] [CRTC:47:pipe A]
<7> [207.827740] i915 0000:00:02.0: [drm:drm_mode_setcrtc] [CONNECTOR:67:HDMI-A-1]
<7> [207.827818] i915 0000:00:02.0: [drm:intel_hdmi_compute_clock [i915]] picking 12 bpc for HDMI output (pipe bpp: 36)
<7> [207.828052] i915 0000:00:02.0: [drm:intel_atomic_check [i915]] [CRTC:47:pipe A] hw max bpp: 36, pipe bpp: 36, dithering: 0
<7> [207.828285] i915 0000:00:02.0: [drm:intel_fdi_atomic_check_link [i915]] checking fdi config on pipe A, lanes 1
<7> [207.828520] i915 0000:00:02.0: [drm] [CRTC:47:pipe A] fastset requirement not met in fdi_m_n (expected tu 64 data 1887436/8388608 link 26214/524288, found tu 64, data 3774873/8388608 link 52428/524288)
<7> [207.828527] i915 0000:00:02.0: [drm] [CRTC:47:pipe A] fastset requirement not met in hw.pipe_mode.crtc_htotal (expected 864, found 858)
<7> [207.828530] i915 0000:00:02.0: [drm] [CRTC:47:pipe A] fastset requirement not met in hw.pipe_mode.crtc_hblank_end (expected 864, found 858)
<7> [207.828558] i915 0000:00:02.0: [drm] [CRTC:47:pipe A] fastset requirement not met in hw.pipe_mode.crtc_hsync_start (expected 732, found 736)
<7> [207.828561] i915 0000:00:02.0: [drm] [CRTC:47:pipe A] fastset requirement not met in hw.pipe_mode.crtc_hsync_end (expected 795, found 798)