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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 HANG, reason: Ring hung, action: reset - Often after suspension"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89915">89915</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>GPU HANG, reason: Ring hung, action: reset - Often after suspension
</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>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jfrusciante@tiscali.it
</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=114884" name="attach_114884" title="GPU crash dump">attachment 114884</a> <a href="attachment.cgi?id=114884&action=edit" title="GPU crash dump">[details]</a></span>
GPU crash dump
Hello,
I had Ubuntu 14.04, kernel 3.16, on Asus UX303LN-R4281H (Optimus Intel +
Nvidia, nvidia drivers currently not installed). I updated to 4.0.0rc6 to solve
a few issues not related with graphics (e.g. touchpad). After the update,
resuming after suspend has some problems. System resumes and then freezes for a
few seconds. Then unfreezes and in the kernel log I find:
[ 71.845023] [drm] stuck on render ring
[ 71.845672] [drm] GPU HANG: ecode 8:0:0xfffffffe, in Xorg [1284], reason:
Ring hung, action: reset
[ 71.845674] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[ 71.845674] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[ 71.845675] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[ 71.845676] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[ 71.845676] [drm] GPU crash dump saved to /sys/class/drm/card0/error
After a couple minutes, kernel log is full of:
drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
Note: I was using Chrome in the while, two tabs were probably using
acceleration (e.g. 3d gmaps). I don't know if it is related, but some minutes
after the system froze completely, without even responding to sysreqs. Never
happened before kernel upgrade.
Now I rebooted with mmio.debug=1, suspended and resumed: it freezed again for
some seconds. Part of dmesg | grep i915:
[ 39.884700] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus
alignment
...
[ 71.852974] drm/i915: Resetting chip after gpu hang
[ 77.848497] [drm:i915_set_reset_status.part.38 [i915]] *ERROR* gpu hanging
too fast, banning!
[ 77.854831] drm/i915: Resetting chip after gpu hang
Attaching GPU crash dump and dmesg after reboot.</pre>
</div>
</p>
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