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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 - X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101998">101998</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr>
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<th>Version</th>
<td>7.7 (2012.06)
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>blocker
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>Driver/AMDgpu
</td>
</tr>
<tr>
<th>Assignee</th>
<td>xorg-driver-ati@lists.x.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tech@meikneubauer.de
</td>
</tr>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=133168" name="attach_133168" title="log file showing segmentation fault">attachment 133168</a> <a href="attachment.cgi?id=133168&action=edit" title="log file showing segmentation fault">[details]</a></span>
log file showing segmentation fault
Note: The problem only occurs if an external monitor is attached!
Kernel initialization is ok. Seeing boot msgs on all ext. monitors driven by
AMD.
Subsequent Greeter load failures are accompanied by these messages:
Aug 1 13:24:59 mnmaster kernel: [ 40.455942]
[drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* channel eq failed: 5 tries
Aug 1 13:24:59 mnmaster kernel: [ 40.455954]
[drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* channel eq failed
Greeter is then stable after a few failures and login is possible.
Xorg.0.log shows segmentation fault:
[ 119.868] randr: falling back to unsynchronized pixmap sharing
[ 120.087] (EE)
[ 120.087] (EE) Backtrace:
[ 120.087] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x55cb016cbf7e]
[ 120.087] (EE) 1: /usr/lib/xorg/Xorg (0x55cb0151a000+0x1b5ce9)
[0x55cb016cfce9]
[ 120.087] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0
(0x7f1587a1d000+0x11390) [0x7f1587a2e390]
[ 120.087] (EE)
[ 120.087] (EE) Segmentation fault at address 0x0
[ 120.087] (EE)
Fatal server error:
[ 120.087] (EE) Caught signal 11 (Segmentation fault). Server aborting
I will add the current Xorg.0.log and also an older Xorg.0.log from April that
used the 4.8.0-36 kernel. Please compare these logs to see that the root cause
seems to be that amdgpu cannot allocate a frame buffer.
I should also mention that kern.log is flooded with these messages (but that
may not be related to the error):
Aug 1 14:44:19 mnmaster kernel: [ 2759.820005] [drm:drm_mode_addfb2 [drm]]
[FB:74]
Aug 1 14:44:19 mnmaster kernel: [ 2759.847678] [drm:drm_mode_addfb2 [drm]]
[FB:77]</pre>
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