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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - BayTrail [DP to LVDS] No signal from LVDS"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78795">78795</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>BayTrail [DP to LVDS] No signal from LVDS
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dominikr@aaeon.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>HI All:
I work for AAEON an Asus company who makes embedded, long life, motherboards. I
am running into a situation with a large customer of mine that wants to use a
15.6" LCD Panel,
<a href="https://dl.dropboxusercontent.com/u/52392/TFT-LCD%2BPreliminary%2BSpecification%2BG156BGE-L01%2Bver%2B1.0.pdf">https://dl.dropboxusercontent.com/u/52392/TFT-LCD%2BPreliminary%2BSpecification%2BG156BGE-L01%2Bver%2B1.0.pdf</a>
connected to the EMB-BT1 with the n2807 SOC, I have also tried the E3825/E3845
series and have the same issue,
<a href="https://dl.dropboxusercontent.com/u/52392/EMB-BT1.pdf">https://dl.dropboxusercontent.com/u/52392/EMB-BT1.pdf</a> connected via the LVDS
Connector. AAEON takes the eDP port and runs it through a Chrontel CH7511,
<a href="http://www.chrontel.com/media/Datasheets/CH7511B%20Brief%20Datasheet%20V1.13.pdf">http://www.chrontel.com/media/Datasheets/CH7511B%20Brief%20Datasheet%20V1.13.pdf</a>
chip to convert it to the LVDS Signal.
The issue I am having is when LVDS is only connected and the system boots up I
do not get a picture on the LCD Panel. Once I kill power to the board and
connect a HDMI or VGA connection the board boots up with Ubuntu 14.04. I am
able to boot into the BIOS and check all the settings but once I leave the BIOS
and Ubuntu tries to start up I get a white screen on the LCD Panel. Here is a
video I took: <a href="https://dl.dropboxusercontent.com/u/52392/LVDS.mp4">https://dl.dropboxusercontent.com/u/52392/LVDS.mp4</a> I have been
trying to load the daily and drm-intel-nightly builds of the latest kernel but
this issue still comes up. I have even tried today's build of 2014-05-15.
I know this is something with the Linux Kernel because when I load up Windows 8
I get a picture automatically every time without this white screen. I also have
tried Timesys 18 Fedora Remix Image:
<a href="https://dl.dropboxusercontent.com/u/52392/GettingStarted_Timesys18FedoraRemix.pdf">https://dl.dropboxusercontent.com/u/52392/GettingStarted_Timesys18FedoraRemix.pdf</a>
and I do not experience this issue.
The system still boots and I can ssh into it. I installed today's latest kernel
2014-05-16 and here is the dmesg: <a href="http://pastebin.com/F59jdUF4">http://pastebin.com/F59jdUF4</a>
Please contact me if you have any questions or things to try. My contact is in
my signature below. Thank you for looking at this issue.</pre>
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