<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - IVB eDP KMS Black Screen (link training)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=64880">64880</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>IVB eDP KMS Black Screen (link training)
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>blocker
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cubicool@gmail.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>Created <span class=""><a href="attachment.cgi?id=79683" name="attach_79683" title="dmesg output">attachment 79683</a> <a href="attachment.cgi?id=79683&action=edit" title="dmesg output">[details]</a></span>
dmesg output
CHIP: IvyBridge GPU (8086:0166)
KERNEL: 3.6.9.1 (vanilla)
DISTRO: Ubuntu 12.04
Bug description: As the machine boots, as soon as KMS throbs the card, the
screen goes entirely black (though brightness still functions) and does not
recover. The system is not locked up, and can be SSH'd into, etc.
Discussing this in IRC the phrase "link training" was used, though I do not
exactly know what indicated such a problem or what the phrase means.
Booting with 'nomodeset i915.modeset=0' lets me use the vesa X driver, and I
get functional (though non-native) virtual consoles.
NOTE: I cannot include any of the register dumps, as I get the following error:
ntel_reg_dumpe:3065 conflicting memory types f7800000-f7c00000
uncached-minus<->write-combining
reserve_memtype failed [mem 0xf7800000-0xf7bfffff], track uncached-minus, req
uncached-minus
System environment:
-- chipset: IvyBridge (8086:0166)
-- system architecture: 64bit
-- kernel: 3.6.9.1 (vanilla)
-- Linux distribution: Ubuntu 12.04
-- Machine or mobo model: Panasonic (prototype)
-- Display connector: eDP-1</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>