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SKL screen flicker after suspend and dmesg "[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun" on HP EliteBook Folio G1

Submitted by RussianNeuroMancer @RussianNeuroMancer

Assigned to Intel GFX Bugs mailing list

Link to original bug (#111201)

Description

Created attachment 144856
dmesg with drm.debug=0x1e log_buf=4M (drm-tip 2019-07-23)

Original bugreport: Bug 103229
Relevant bugreport: Bug 108462

As described in Comment 55 of original bugreport, issue is still reproducible on HP EliteBook Folio G1, but now happen only after suspend / resume cycle.

In attached log (dmesg with drm.debug=0x1e log_buf=4M on cod/tip/drm-tip/2019-07-23 ec297a234e92aa258bba523320898f408d0cf147) I suspend and resume laptop once, switched between windowed and fullscreen mode on YouTube in Firefox, launched mc and exited from mc few times, back to Firefox, switched to fullscreen YouTube again, got flickering.

Workarounds:

  1. Imre workaround from https://bugs.freedesktop.org/show_bug.cgi?id=108462#c18
    2 intel_idle.max_cstate=4

**Attachment 144856**, "dmesg with drm.debug=0x1e log_buf=4M (drm-tip 2019-07-23)":
dmesg
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