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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 - 4.12, AMD A10-9600P, AMD-Vi: Completion-Wait loop timed out."
href="https://bugs.freedesktop.org/show_bug.cgi?id=102301">102301</a>
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<th>Summary</th>
<td>4.12, AMD A10-9600P, AMD-Vi: Completion-Wait loop timed out.
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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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>
</tr>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ahammington@mail.ru
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=133615" name="attach_133615" title="dmesg, showing a boot without iommu=soft">attachment 133615</a> <a href="attachment.cgi?id=133615&action=edit" title="dmesg, showing a boot without iommu=soft">[details]</a></span>
dmesg, showing a boot without iommu=soft
Hello amd devs,
and whomever it might affect or who is interested.
Kernel: 4.12.8
linux-firmware-amd-20170622
xf86-video-amdgpu-1.3.0
CPU: AMD A10-9600P
GPU: Radeon R7 (M440 or sth.)
After boot when presented with the login screen, the system repeatedly outputs
"AMD-Vi: Completion-Wait loop timed out." and most of the time this corrupts
the file system while doing this.
Booting the kernel with iommu=soft circumvents the problem, but introduces
other issues on this machine.
I am following this issue for some time now.
A have a fairly recent notebook (yes, I know. it's a lot to ask for support on
too recent hardware).
But i see hope, as there already has been succesfull patching by the amd crew!
I found a bugreport on launchpad [1] (strange enough they posted it there),
which led to a patch on freedesktop [2], and i happily got it to work with
4.11. System was bootable without the iommu=soft command.
With linux now advancing to 4.12, the patch is not applyable anymore, so here i
am now, reporting the issue again, in the hope to get new info and a tiny bit
of help/advice.
Thanks in advance.
[1]: <a class="bz_bug_link
bz_status_NEW "
title="NEW - notebook does not work when not booted using nomodeset AMD APU"
href="show_bug.cgi?id=101029">https://bugs.freedesktop.org/show_bug.cgi?id=101029</a>
[2]: <a href="https://patchwork.freedesktop.org/series/21684/">https://patchwork.freedesktop.org/series/21684/</a>
_________________
# lspci -vv | grep -A 3 -i "display"
03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT
[Radeon R7 M260/M265 / M340/M360 / M440/M445] (rev ff) (prog-if ff)
!!! Unknown header type 7f
Kernel driver in use: amdgpu
Kernel modules: amdgpu</pre>
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