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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Kernel 4.13+ nouveau breaks screen output"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103421">103421</a>
</td>
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<th>Summary</th>
<td>Kernel 4.13+ nouveau breaks screen output
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/nouveau
</td>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>kbaikov@suse.com
</td>
</tr>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=135010" name="attach_135010" title="kernel log">attachment 135010</a> <a href="attachment.cgi?id=135010&action=edit" title="kernel log">[details]</a></span>
kernel log
There is a regression with my
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF119 [NVS
310] [10de:107d] (rev a1)
where I would not get any graphics output anymore with Linux kernel
4.13.x, not even (framebuffer) text consoles.
There is a NULL pointer dereference around nvkm_dp_train_drive
visible in dmesg (attached)
and looking at the nouveau.ko disassembly, the faulting instruction was
a call to a variable address e.g. from
drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c:
ior->func->dp.drive(ior, i, ocfg.pc, ocfg.dc,
ocfg.pe, ocfg.tx_pu);
which was introduced in commit af85389c614ae
so maybe you have a hint at what might be wrong or how to further debug
this problem...
With 4.12.8, there was a different NULL pointer deref but some working
graphics.
I also tried 4.14-rc3 or such but that still had broken graphics.
Thanks in advance for any help</pre>
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