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<base href="https://bugs.freedesktop.org/" />
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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 --- - [SNA IVB] External monitor (VGA1) unusable if plugged in after xorg start"
href="https://bugs.freedesktop.org/show_bug.cgi?id=66563">66563</a>
</td>
</tr>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SNA IVB] External monitor (VGA1) unusable if plugged in after xorg start
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>timo@kamph.org
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>Driver/intel
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>After upgrading from xf86-video-intel-2.21.10 to 2.21.11, the external monitor
I attach to my laptop (VGA1) shows only some red pixels on black background if
I attach the monitor after xorg started. If the monitor is attached during
boot, it works fine. On LVDS1 and on screenshots, the image is correct.
Therefore, the issue seems to be the output and not the rendering.
Actually, you can recognize window borders and some (originally black) text in
the red pixels. The black background in the terminal emulator is displayed
completely red.
The issue is still present in git (commit
1445a62da8a08acd8a732176d085fd098f68cec3). Bisecting the commits between
2.21.10 and 2.21.11 locates the problem between commit
362b0dc6a3b1692b752d8f250075ccc81debfca3 (good) and commit
362b0dc6a3b1692b752d8f250075ccc81debfca3 (bad). Trying any of the commits in
between results in a black screen on LVDS1 and an unusable X.</pre>
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