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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CFL] FIFO underruns on a hybrid machine but only while on "performance" (dGPU) mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109248">109248</a>
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<th>Summary</th>
<td>[CFL] FIFO underruns on a hybrid machine but only while on "performance" (dGPU) mode
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>tjaalton@ubuntu.com
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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
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<pre>Hi
Dell Inspiron 7580 hybrid laptop has issues with external monitors when on
"performance" (dGPU) mode; the external screen will start blinking and dmesg
has lots of:
[492.008927] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
[492.009818] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
I don't have full logs right now, but at least 4.20 is still affected.
Everything newer would need a patched nvidia dkms and that hasn't been tried
yet..
when it's running on iGPU everything is fine AIUI</pre>
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