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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 - [SKL mobile] Some flickering then complete system freeze after HDMI hotplug"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94625">94625</a>
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<th>Summary</th>
<td>[SKL mobile] Some flickering then complete system freeze after HDMI hotplug
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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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>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
</td>
</tr>
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<th>Reporter</th>
<td>oskar.berggren@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>When connecting an HDMI monitor, the external monitor lights up, but the
laptop's internal panel will flicker, usually until I type a key (have an open
xterm focused already) or move the mouse pointer slightly. The display is then
stable and I might be able to move the mouse pointer around and start some
programs, but after a while the system freeze completely (doesn't respond to
ping).
System is Dell XPS 15 9550, i7-6700HQ, stepping 3, microcode 0x74.
Internal panel is eDP1, 3840x2160.
External is 1920x1200. I've tried the HDMI port, and also with a TB3->DP
and TB3->HDMI adapters, all with same results.
This system also has NVIDIA GM107M, but I've disabled both the nouveau and the
nvidia driver to rule that out.
"move the mouse pointer" means using the built-in touchpad.
With
Fedora 23 plus kernel drm-intel-nightly as of 2016-03-10 21:00 UTC
the system will typically freeze hard within 10 seconds of inserting the HDMI
cable (in the laptops fixed HDMI port). It feels like the freeze happens when I
touch the mouse, but I'm not sure if that's just coincidence.
With
Fedora 23 plus kernel drm-intel-nightly as of 2016-03-19 13:00 UTC
the behaviour is slightly improved. I'm now been able to use the system for
minutes after hotplugging the external monitor. I still get the flickering of
the internal panel when inserting the cable - this disappears when I touch the
mouse. I'm then able to type, use the mouse, move windows between internal and
external display, etc, with no freeze happening. After a while with no apparent
problems, I disconnected the external monitor - still no problems - then
reconnected it again. The external display lights up as expected, but now the
complete freeze occurred within a few seconds.
Some more attempts indicate that it can still freeze (shortly after) the first
hotplug, but sometimes not until after the second or third. So it seems
reproducible around 3 out of 4 times.
It can also freeze if I use the Gnome Display control panel to disable the
external monitor, then enabling it again (without removing the cable).
Sometimes the flickering that occurs after hotplug will go away if I touch the
touchpad slightly, and pressing a key doesn't help. Other times it's the
reverse - pressing a key will stop the flickering, but then moving the mouse
pointer slightly will set it off again.
During these tests it's happened that the internal panel remains black. At one
point it behaved like this:
a) move the mouse pointer to the EXTERNAL panel => internal panel lights up.
b) move the mouse pointer back to the INTERNAL panel => internal panel goes
black.
During this maneuver, the external panel consistently showed a correct image.</pre>
</div>
</p>
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