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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 - WARNING: CPU: 11 PID: 1137 at drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88 dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107456">107456</a>
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<th>Summary</th>
<td>WARNING: CPU: 11 PID: 1137 at drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88 dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/AMDgpu
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>marc@dragonfly.plus.com
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=140936" name="attach_140936" title="dmesg output">attachment 140936</a> <a href="attachment.cgi?id=140936&action=edit" title="dmesg output">[details]</a></span>
dmesg output
I see the following warning during boot with Linux kernel 4.18.0-rc6 & 4.17.10:
root@deepthought:~# dmesg | grep WARN
[ 9.346100] WARNING: CPU: 11 PID: 1137 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88
dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]
[ 9.346162] WARNING: CPU: 14 PID: 1139 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88
dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]
Hardware is Ryzen 7 2700x, Sapphire Technology Radeon RX 480, IIyama ProLite
XB2380HS connected via DVI.
It looks like "dm_dp_aux_transfer" is used to setup DisplayPort, using "struct
drm_dp_aux_msg — DisplayPort AUX channel transaction". Now, with my hardware I
don't have any monitors connected via DisplayPort. Is that relevant?
I patched in a "printk("msg->size = %d\n", msg->size);" and it displays the
result twice, which is curious.
# dmesg | grep -i "msg->size"
[ 9.469511] msg->size = -5
[ 9.469803] msg->size = -5
Anyway, full "dmesg" attached.</pre>
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