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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GPU freeze / hang on ubuntu 14.10"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90106">90106</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>GPU freeze / hang on ubuntu 14.10
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ghostrider@trollaris.de
</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>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=115201" name="attach_115201" title="/sys/class/drm/card0/error">attachment 115201</a> <a href="attachment.cgi?id=115201&action=edit" title="/sys/class/drm/card0/error">[details]</a></span>
/sys/class/drm/card0/error
Using ubuntu 14.04 my i7 Sandy Bridge system with onboard graphics had no gpu
problems at all, using kernel boot parameters "i915.i915_enable_rc6=0" and
"i915.semaphores=0".
After upgrading to 15.04 beta it would frequently slow down due to frequent
frequent gpu hangs / slow-downs / crashes, with or without the old i915 boot
parameters. The system became unusable.
After a complete re-install using ubuntu 14.10 it crashed once after running
stably nearly a day (no i915 boot parameters were given).
Memory checks had never failed.
This is what dmesg says:
[29907.376682] [drm] GPU HANG: ecode -1:0x00000000, reason: Kicking stuck
semaphore on render ring, action: continue
[29907.376684] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[29907.376685] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[29907.376685] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[29907.376686] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[29907.376687] [drm] GPU crash dump saved to /sys/class/drm/card0/error
So I did as ordered.</pre>
</div>
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