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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 panic when waking up after screens go to dpms sleep"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111659">111659</a>
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<th>Summary</th>
<td>Kernel panic when waking up after screens go to dpms sleep
</td>
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<th>Product</th>
<td>DRI
</td>
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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>
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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>not set
</td>
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<th>Component</th>
<td>DRM/Radeon
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>brad@fnarfbargle.com
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=145332" name="attach_145332" title="Multiple instances of the Panic">attachment 145332</a> <a href="attachment.cgi?id=145332&action=edit" title="Multiple instances of the Panic">[details]</a></span>
Multiple instances of the Panic
iMac late 2011 with 2 Thunderbolt displays.
Kernel 5.2 finally got DP routing working to allow both TB displays to work,
however I'm now getting lockups which appear to be triggered in
radeon_dp_needs_link_train.
I'm capturing these over netconsole as it leaves the machine paralysed.
Attachment faults.txt has 4 separate instances of the fault from 4 different
boots.
This machine stays on 24/7 and this seems to occur when the displays wake up
after a dpms sleep. Having said that I've also seen the fault when doing
something innocuous like changing the audio volume.
Generally at least 2 of the screens wakeup, so I have displays with a
lockscreen asking for a password and a mouse, but the machine is dead.
The last example in faults.txt left the machine in a state where I could ssh in
and reboot it. All the others required a hard power cycle.
I'm currently using 5.2.11. Previously I was using 4.17, but I can't roll back
prior to 5.2 without losing the second TB display, and it can take hours or
days to hit so bisection would be difficult.
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Blackcomb [Radeon HD 6970M/6990M] (prog-if 00 [VGA controller])
Subsystem: Apple Inc. Radeon HD 6970M
Flags: bus master, fast devsel, latency 0, IRQ 79
Memory at 90000000 (64-bit, prefetchable) [size=256M]
Memory at a8800000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 2000 [size=256]
Expansion ROM at a8820000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon
Kernel modules: radeon</pre>
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