few tests - dmesg-warn/dmesg-fail - CPU pipe .* FIFO underrun

http://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1654983576?query_key=55d2eba8f42a98acf7b605f79d0d350519cdc3c2

<7> [303.320219] i915 0000:00:02.0: [drm:drm_mode_rmfb_work_fn] Removing [FB:120] from all active usage due to RMFB ioctl
<7> [303.320785] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:119]
<7> [303.336175] i915 0000:00:02.0: [drm:drm_mode_rmfb_work_fn] Removing [FB:118] from all active usage due to RMFB ioctl
<7> [303.385566] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:113]
<7> [303.390593] i915 0000:00:02.0: [drm:vlv_compute_pipe_wm [i915]] sprite E watermarks: PM2=1, PM5=1, DDR DVFS=0
<7> [303.392499] i915 0000:00:02.0: [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled)
<3> [303.415994] i915 0000:00:02.0: [drm] *ERROR* CPU pipe C FIFO underrun
<7> [303.435547] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:118]
<7> [303.438031] i915 0000:00:02.0: [drm:vlv_compute_pipe_wm [i915]] sprite E watermarks: PM2=2, PM5=2, DDR DVFS=0
<7> [303.440509] i915 0000:00:02.0: [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled)
<7> [303.467804] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:113]
<7> [303.471817] i915 0000:00:02.0: [drm:vlv_compute_pipe_wm [i915]] sprite E watermarks: PM2=4, PM5=4, DDR DVFS=0
<7> [303.474664] i915 0000:00:02.0: [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled)
<7> [303.483689] i915 0000:00:02.0: [drm:drm_mode_rmfb_work_fn] Removing [FB:118] from all active usage due to RMFB ioctl
<7> [303.500442] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:118]
<7> [303.508513] i915 0000:00:02.0: [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled)
<7> [303.536701] i915 0000:00:02.0: [drm:drm_mode_addfb2] [FB:113]
<7> [303.539961] i915 0000:00:02.0: [drm:vlv_compute_pipe_wm [i915]] sprite E watermarks: PM2=2, PM5=2, DDR DVFS=0
<7> [303.542324] i915 0000:00:02.0: [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled)
<7> [303.549771] i915 0000:00:02.0: [drm:drm_mode_rmfb_work_fn] Removing [FB:118] from all active usage due to RMFB ioctl