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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - External displays remain blank with linux-3.18.6 after resuming from suspend"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89589">89589</a>
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<th>Summary</th>
<td>External displays remain blank with linux-3.18.6 after resuming from suspend
</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)
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</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
</td>
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<th>Reporter</th>
<td>freedesktop@h.totakura.in
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>External displays connected to a DP Hub remain blank after resuming from
suspend starting from linux-3.18; they used to work with linux-3.17.
My setup has a Haswell Thinkpad connected to a DP Hub. The laptop's display
turns back on fine. I am able to turn back the external displays by first
turning them off via xrandr and then turning them on.
This behavior remains with linux-3.18.9 and linux-3.19.1
Is this bug already known? If not, I can assist you with debugging if you can
tell me where to look at.</pre>
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