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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="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"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111201">111201</a>
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<th>Summary</th>
<td>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
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>russianneuromancer@ya.ru
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=144856" name="attach_144856" title="dmesg with drm.debug=0x1e log_buf=4M (drm-tip 2019-07-23)">attachment 144856</a> <a href="attachment.cgi?id=144856&action=edit" title="dmesg with drm.debug=0x1e log_buf=4M (drm-tip 2019-07-23)">[details]</a></span>
dmesg with drm.debug=0x1e log_buf=4M (drm-tip 2019-07-23)
Original bugreport: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - SKL screen flicker and dmesg [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="show_bug.cgi?id=103229">Bug 103229</a>
Relevant bugreport: <a class="bz_bug_link
bz_status_NEW "
title="NEW - two external screens permanently go blank on HP EliteBook Folio G1"
href="show_bug.cgi?id=108462">Bug 108462</a>
As described in <a href="show_bug.cgi?id=111201#c55">Comment 55</a> 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 <a class="bz_bug_link
bz_status_NEW "
title="NEW - two external screens permanently go blank on HP EliteBook Folio G1"
href="show_bug.cgi?id=108462#c18">https://bugs.freedesktop.org/show_bug.cgi?id=108462#c18</a>
2 intel_idle.max_cstate=4</pre>
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