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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 - [i915 Skylake] HDMI output does not work; "dp_aux_ch not started" warning"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92685">92685</a>
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<tr>
<th>Summary</th>
<td>[i915 Skylake] HDMI output does not work; "dp_aux_ch not started" warning
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ebiggers3@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=119210" name="attach_119210" title="kernel log with drm.debug=14">attachment 119210</a> <a href="attachment.cgi?id=119210&action=edit" title="kernel log with drm.debug=14">[details]</a></span>
kernel log with drm.debug=14
Running Linux 4.3-rc7 on a laptop with Intel Skylake integrated graphics, I
encountered warnings in the kernel log and a several second hang during boot.
Furthermore, an external monitor attached to the HDMI input did not work. The
problems occur every boot. The full dmesg output with drm.debug=14 is
attached; some highlights are shown below:
[ 1.401196] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
[ 1.414508] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
[ 1.427851] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
[ 1.427853] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status
0xad40001f
[ 1.447865] ------------[ cut here ]------------
[ 1.447867] WARNING: CPU: 1 PID: 6 at drivers/gpu/drm/i915/intel_dp.c:854
intel_dp_aux_ch+0x10f/0x6a0()
[ 1.447867] dp_aux_ch not started status 0xad40001f
...
[ 8.043643] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 130
...
[ 32.571277] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 130
...
[ 32.608835] i915 0000:00:02.0: HDMI-A-1: EDID block 0 invalid.</pre>
</div>
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