Dmesg
<6> [1235.466772] [IGT] kms_atomic_transition: starting dynamic subtest HDMI-A-2-pipe-C
<7> [1235.467307] [drm:drm_mode_addfb2] [FB:290]
<7> [1235.467873] i915 0000:00:02.0: [drm:intel_atomic_check [i915]] [CONNECTOR:263:HDMI-A-2] Limiting display bpp to 24 instead of EDID bpp 24, requested bpp 36, max platform bpp 36
<7> [1235.468381] i915 0000:00:02.0: [drm:intel_hdmi_compute_config [i915]] picking 8 bpc for HDMI output (pipe bpp: 24)
<7> [1235.468935] i915 0000:00:02.0: [drm:intel_atomic_check [i915]] hw max bpp: 24, pipe bpp: 24, dithering: 0
<7> [1235.468982] i915 0000:00:02.0: [drm:intel_ddi_compute_config_late [i915]] [ENCODER:262:DDI C (TC)/PHY TC1] [CRTC:236:pipe C]
<7> [1235.469027] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in cpu_transcoder (expected 4, found 2)
<7> [1235.469072] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in output_types (expected 0x00000100, found 0x00000040)
<7> [1235.469115] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_hdisplay (expected 3840, found 1920)
<7> [1235.469157] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_htotal (expected 4000, found 2200)
<7> [1235.469198] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_hblank_start (expected 3840, found 1920)
<7> [1235.469240] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_hblank_end (expected 4000, found 2200)
<7> [1235.469281] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_hsync_start (expected 3888, found 2008)
<7> [1235.469322] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_hsync_end (expected 3920, found 2052)
<7> [1235.469362] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_vdisplay (expected 2160, found 1080)
<7> [1235.469403] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_vtotal (expected 2222, found 1125)
<7> [1235.469444] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_vblank_start (expected 2160, found 1080)
<7> [1235.469484] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_vblank_end (expected 2222, found 1125)
<7> [1235.469524] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_vsync_start (expected 2163, found 1084)
<7> [1235.469564] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_vsync_end (expected 2168, found 1089)
<7> [1235.469604] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_hdisplay (expected 0, found 1920)
<7> [1235.469644] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_htotal (expected 0, found 2200)
<7> [1235.469695] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_hblank_start (expected 0, found 1920)
<7> [1235.469769] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_hblank_end (expected 0, found 2200)
<7> [1235.469826] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_hsync_start (expected 0, found 2008)
<7> [1235.469866] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_hsync_end (expected 0, found 2052)
<7> [1235.469907] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_vdisplay (expected 0, found 1080)
<7> [1235.469947] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_vtotal (expected 0, found 1125)
<7> [1235.469988] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_vblank_start (expected 0, found 1080)
<7> [1235.470028] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_vblank_end (expected 0, found 1125)
<7> [1235.470068] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_vsync_start (expected 0, found 1084)
<7> [1235.470108] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_vsync_end (expected 0, found 1089)
<7> [1235.470154] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.flags (1) (expected 0, found 1)
<7> [1235.470193] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.flags (4) (expected 0, found 4)
<7> [1235.470233] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.pipe_mode.crtc_clock (expected 533250, found 148500)
<7> [1235.470273] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in hw.adjusted_mode.crtc_clock (expected 0, found 148500)
<7> [1235.470319] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in port_clock (expected 540000, found 148500)
<7> [1235.470358] i915 0000:00:02.0: [drm:pipe_config_mismatch [i915]] [CRTC:236:pipe C] fastset mismatch in infoframes.enable (expected 0x00000004, found 0x00000000)
<7> [1235.470424] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] [CRTC:236:pipe C] dbuf slices 0x2, ddb (1024 - 2048), active pipes 0x4
<7> [1235.470459] i915 0000:00:02.0: [drm:skl_compute_wm [i915]] Enabled dbuf slices 0x1 -> 0x3 (out of 2 dbuf slices)