few kms tests - dmesg-warn - *ERROR* CPU pipe .* FIFO underrun
<6> [173.921556] Console: switching to colour dummy device 80x25
<6> [173.922451] [IGT] kms_flip: executing
<7> [173.966838] i915 0000:00:02.0: [drm:i915_gem_open [i915]]
<7> [173.968859] i915 0000:00:02.0: [drm:i915_drop_caches_set [i915]] Dropping caches: 0x000001dc [0x000001dc]
<7> [173.969882] i915 0000:00:02.0: [drm:i915_gem_open [i915]]
<7> [173.980792] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:127:DP-2]
<7> [173.980820] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [CONNECTOR:127:DP-2]
<7> [173.986068] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:127:DP-2] disconnected
<7> [173.986889] i915 0000:00:02.0: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:115:DP-1]
<7> [173.986912] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [CONNECTOR:115:DP-1]
<7> [173.988474] i915 0000:00:02.0: [drm:lspcon_wake_native_aux_ch [i915]] Native AUX CH up, DPCD version: 1.2
<7> [173.989166] i915 0000:00:02.0: [drm:lspcon_resume [i915]] LSPCON recovering in PCON mode after 0 ms
<7> [173.990506] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [173.992530] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [173.994567] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [173.996278] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [173.998741] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.001059] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.003279] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.005298] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.007082] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.008146] i915 0000:00:02.0: [drm:lspcon_wait_mode [i915]] Current LSPCON mode PCON
<7> [174.009746] i915 0000:00:02.0: [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX B/DDI B/PHY B: DPCD: 12 14 c4 01 01 15 01 81 00 00 04 00 0f 00 04
<7> [174.010771] i915 0000:00:02.0: [drm:drm_dp_dump_desc [drm_display_helper]] AUX B/DDI B/PHY B: DP branch: OUI 00-60-ad dev-ID MC2800 HW-rev 2.2 SW-rev 1.77 quirks 0x0000
<7> [174.013066] i915 0000:00:02.0: [drm:drm_dp_read_downstream_info [drm_display_helper]] AUX B/DDI B/PHY B: DPCD DFP: 0b f0 03 11
<7> [174.013903] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [ENCODER:114:DDI B/PHY B] MST support: port: yes, sink: SST, modparam: yes -> enable: SST
<7> [174.020324] i915 0000:00:02.0: [drm:intel_dp_print_rates [i915]] source rates: 162000, 216000, 243000, 270000, 324000, 432000, 540000
<7> [174.020889] i915 0000:00:02.0: [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000
<7> [174.021574] i915 0000:00:02.0: [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
<7> [174.023856] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.025922] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.027783] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.029786] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.032018] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.034001] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.036042] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.038049] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.040044] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.042041] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.044097] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.046381] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.048452] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.050337] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.052273] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.054456] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.056627] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.058571] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.060498] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.062389] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.064240] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.066381] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.068156] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.070333] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.072228] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.074534] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.076676] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.078998] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer
<7> [174.081045] i915 0000:00:02.0: [drm:drm_dp_i2c_do_msg [drm_display_helper]] AUX B/DDI B/PHY B: native defer