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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 - [BSW] No output on internal laptop display"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92129">92129</a>
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<th>Summary</th>
<td>[BSW] No output on internal laptop display
</td>
</tr>
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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>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>gentoo@gishpuppy.com
</td>
</tr>
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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>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=118457" name="attach_118457" title="dmesg with drm.debug=0x1e">attachment 118457</a> <a href="attachment.cgi?id=118457&action=edit" title="dmesg with drm.debug=0x1e">[details]</a></span>
dmesg with drm.debug=0x1e
System architecture: x86_64
Kernel version: 4.1.6-alt460-amd64
Linux distribution: SystemRescueCd 4.6.0 (based on Gentoo Linux)
Machine: Acer TravelMate B116-M-P16S
Processor: Intel Pentium N3700
Display: Internal LCD (connected using eDP-1 according to /sys/class/drm/)
When the KMS driver loads I no longer see any output on the laptop screen
(backlight remains on). Output via HDMI works.
The kernel log shows a warning about a timeout including back trace (see
attached dmesg output with debug info).
The internal display only works if I add i915.modeset=0 to the boot options or
if I boot an older kernel that doesn't use KMS.
The problem is reproducible with other kernel versions/distributions (e.g.
Lubuntu 15.04 (Kernel 3.19.0)).</pre>
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