few tests - dmesg-warn - *ERROR* CPU pipe .* FIFO underrun

https://gfx-ci.igk.intel.com/cibuglog-ng/testresult/2053605045?query_key=c098ac0adc16ca08208aaa239512ad8ea3bcc683

<6> [155.448882] input: HDA Intel PCH Line Out as /devices/pci0000:00/0000:00:1f.3/sound/card0/input19
<6> [155.449530] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input20
<6> [155.450301] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input21
<6> [155.451106] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input22
<6> [155.451958] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input23
<6> [155.453312] input: HDA Intel PCH HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input24
<3> [155.720153] i915 0000:00:02.0: [drm] *ERROR* CPU pipe B FIFO underrun
<7> [155.722620] i915 0000:00:02.0: [drm:intel_fbc_underrun_work_fn [i915]] Disabling FBC due to FIFO underrun.
<7> [155.735974] i915 0000:00:02.0: [drm:__intel_fbc_disable [i915]] Disabling FBC on [PLANE:32:plane 1A]
<7> [156.368301] [IGT] core_hotunplug: reopening DRM device for health check
<7> [156.368342] i915 0000:00:02.0: [drm:i915_gem_open [i915]] 
<7> [156.368963] [IGT] core_hotunplug: running i915 GPU healthcheck
<7> [156.371362] [IGT] core_hotunplug: running device sysfs healthcheck
<7> [156.371659] [IGT] core_hotunplug: running i915 device perf healthcheck
<7> [156.372071] [IGT] core_hotunplug: closing health checked device instance
<7> [156.388336] i915 0000:00:02.0: [drm:drm_client_dev_restore] intel-fbdev: ret=0
<7> [156.388933] [IGT] core_hotunplug: reopening render device for health check
<7> [156.388997] i915 0000:00:02.0: [drm:i915_gem_open [i915]] 
<7> [156.390178] [IGT] core_hotunplug: running i915 GPU healthcheck