All tests - *ERROR* CPU pipe [ABC] FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_7918/re-ehl-1/igt@gem_ctx_isolation@rcs0-none.html

7> [323.376249] i915 0000:00:02.0: [drm:intel_dp_start_link_train [i915]] Using LINK_BW_SET value 1e
<7> [323.376981] i915 0000:00:02.0: [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
<7> [323.377061] i915 0000:00:02.0: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
<7> [323.377181] i915 0000:00:02.0: [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
<7> [323.379135] i915 0000:00:02.0: [drm:intel_dp_set_signal_levels [i915]] Using vswing level 1
<7> [323.379312] i915 0000:00:02.0: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
<7> [323.381508] i915 0000:00:02.0: [drm:intel_dp_set_signal_levels [i915]] Using vswing level 2
<7> [323.381583] i915 0000:00:02.0: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
<7> [323.382776] i915 0000:00:02.0: [drm:intel_dp_start_link_train [i915]] clock recovery OK
<7> [323.382850] i915 0000:00:02.0: [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS7
<7> [323.384677] i915 0000:00:02.0: [drm:intel_dp_start_link_train [i915]] Channel EQ done. DP Training successful
<7> [323.384858] i915 0000:00:02.0: [drm:intel_dp_start_link_train [i915]] [CONNECTOR:215:DP-1] Link Training Passed at Link Rate = 810000, Lane count = 4
<3> [323.388870] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
<7> [323.389249] [drm:intel_fbc_underrun_work_fn [i915]] Disabling FBC due to FIFO underrun.
<7> [323.396973] i915 0000:00:02.0: [drm:i915_gem_context_create_ioctl [i915]] HW context 5 created
<7> [323.409842] [drm:validate_displayid.constprop.39] base revision 0x12, length 36, 3 0
<7> [323.409850] [drm:drm_get_edid] block id 0x3, rev 1, len 20
<7> [323.409856] [drm:drm_get_edid] block id 0x7, rev 0, len 10
<7> [323.409861] [drm:drm_get_edid] found DisplayID tag 0x7, unhandled
<7> [323.409866] [drm:drm_detect_monitor_audio] Monitor has basic audio support
<7> [323.411440] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-1 (pin 5) received hotplug event.
<7> [323.411520] [drm:intel_hdmi_detect [i915]] [CONNECTOR:225:HDMI-A-1]
<7> [323.412635] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
<7> [323.412719] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
<7> [323.413060] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
<7> [323.413074] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
<7> [323.413148] [drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed, retry using GPIO bit-banging
<7> [323.413329] [drm:intel_gmbus_force_bit [i915]] enabling bit-banging on i915 gmbus dpb. force bit now 1
<7> [323.419300] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
<7> [323.419389] [drm:intel_gmbus_force_bit [i915]] disabling bit-banging on i915 gmbus dpb. force bit now 0
<7> [323.419739] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1)
<7> [323.419811] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
<7> [323.420151] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0040 w(1)
<7> [323.420512] [drm:drm_dp_dual_mode_detect] DP dual mode HDMI ID:  (err -6)
<7> [323.426761] i915 0000:00:02.0: [drm:i915_gem_context_create_ioctl [i915]] HW context 6 created
<7> [323.456377] i915 0000:00:02.0: [drm:i915_gem_context_create_ioctl [i915]] HW context 7 created
<7> [323.485977] i915 0000:00:02.0: [drm:i915_gem_context_create_ioctl [i915]] HW context 8 created
<7> [323.651200] i915 0000:00:02.0: [drm:gen8_de_irq_handler [i915]] hotplug event received, stat 0x01000000, dig 0x0000000a, pins 0x00000040, long 0x00000040
<7> [323.651281] [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 6 - cnt: 20
<5> [323.715544] Setting dangerous option reset - tainting kernel
<5> [323.725859] Setting dangerous option reset - tainting kernel
<5> [323.735886] Setting dangerous option reset - tainting kernel
<6> [323.744909] [IGT] gem_ctx_isolation: exiting, ret=0
<5> [323.745372] Setting dangerous option reset - tainting kernel
<6> [323.746870] Console: switching to colour frame buffer device 480x135