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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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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 --- - HDMI gives no more signal"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84203">84203</a>
</td>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>HDMI gives no more signal
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jean-louis@dupond.be
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/nouveau
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
</tr></table>
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<pre>This week I tried HDMI again on my system, and noticed it was completely
broken.
Got just no signal on my screen.
I knew it was working some months (and upgrades) ago.
After testing I found out the issue was introduced between kernel v3.14 and
v3.15.
Situation:
Insert HDMI cable into my laptop, and no signal on the external display.
The dmesg fills with errors also:
[ 186.210622] nouveau E[ PDISP][0000:01:00.0] INVALID_STATE [UNK08] chid 0
mthd 0x0080 data 0x00000000
[ 186.210627] nouveau E[ PDISP][0000:01:00.0] Core:
[ 186.210634] nouveau E[ PDISP][0000:01:00.0] 0x0084: 0x5dc34da1 ->
0x80000000
[ 186.210640] nouveau E[ PDISP][0000:01:00.0] 0x0088: 0x00000000
etc.
After some git bisect playtime, I found out the following commit caused the
issue:
<a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/nouveau?id=05c63c2ff23a80b654d6c088ac3ba21628db0173">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/nouveau?id=05c63c2ff23a80b654d6c088ac3ba21628db0173</a>
So I went back to stable 3.16 (Ubuntu Utopic version), and did a git revert for
that commit.
And yep, HDMI output was working again, and no more nouveau errors in dmesg.
My device:
[ 30.823267] nouveau [ DEVICE][0000:01:00.0] BOOT0 : 0x0c1a00a1
[ 30.823269] nouveau [ DEVICE][0000:01:00.0] Chipset: GF108 (NVC1)
[ 30.823270] nouveau [ DEVICE][0000:01:00.0] Family : NVC0
Laptop dell xps 15 l502x</pre>
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</p>
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