<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CHV] Surface 3 does not get correct EDID from firmware"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96255">96255</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[CHV] Surface 3 does not get correct EDID from firmware
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>stephenjust@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>On the Surface 3 (Atom x7 X8700), the kernel is unable to get the correct EDID
data for the display. As a result, the correct display dimensions are not set,
meaning that user-space programs that depend on this info do not have it. As an
example, Gnome would kick in to Hi-DPI mode if the correct dimensions were
available.
Windows seems to be able to fetch an EDID record for the display with the
proper dimensions set, and as far as I can tell it doesn't use any mechanisms
to override the EDID using a specific driver implying that the GPU could be
accessing it somehow.
I will attach an export of the Windows Registry showing what it can see. In
this file, DISPLAY\MEI9001\4 is the Surface's screen with the correct
dimensions specified.
Work around:
1. Build a kernel with CONFIG_DRM_LOAD_EDID_FIRMWARE=Y
2. Download attached EDID record (extracted on Windows), surface3.bin, to
/lib/firmware/edid/surface3.bin
3. Add drm_kms_helper.edid_firmware=DSI-1:edid/surface3.bin to your kernel line</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
<li>You are the QA Contact for the bug.</li>
</ul>
</body>
</html>