[Bug 111201] New: 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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111201

            Bug ID: 111201
           Summary: 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
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: russianneuromancer at ya.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144856
  --> https://bugs.freedesktop.org/attachment.cgi?id=144856&action=edit
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

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