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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 --- - Screen turns black during boot after driver tries to set mode on NV50"
href="https://bugs.freedesktop.org/show_bug.cgi?id=55412">55412</a>
</td>
</tr>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Screen turns black during boot after driver tries to set mode on NV50
</td>
</tr>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>lubosz@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>git
</td>
</tr>
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<th>Component</th>
<td>Driver/nouveau
</td>
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<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=67816" name="attach_67816" title="kernel log without flags">attachment 67816</a> <a href="attachment.cgi?id=67816&action=edit" title="kernel log without flags">[details]</a></span>
kernel log without flags
The following commit on current nouveau git master breaks setting a valid
resolution at boot and results in a black screen.
commit 97d6852410a83e413d85649cb2cc10e17d6ee2ab
Author: Ben Skeggs <<a href="mailto:bskeggs@redhat.com">bskeggs@redhat.com</a>>
Date: Thu Jul 26 08:51:21 2012 +1000
drm/nouveau/acpi: move definitions out of nouveau_drv.h
Signed-off-by: Ben Skeggs <<a href="mailto:bskeggs@redhat.com">bskeggs@redhat.com</a>>
An interesting thing about this bug is that it can be avoided with adding the
kernel flag nouveau.reg_debug=0x600. With this flag a wrong resolution is set
at boot and the screen does not turn black. The X Server cannot start anyway.
My native resolution is 1366x768. GRUB_GFXMODE is 1360x768x32, since the
greater resolution is not listed in grub's vbeinfo.
nouveau and blob run X with 1366x768.
I will attach a log with and without the flag at commit
97d6852410a83e413d85649cb2cc10e17d6ee2ab.</pre>
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