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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 - [HP Compaq dc7800 Small Form Factor PC] suspend/resume failure"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93486">93486</a>
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<th>Summary</th>
<td>[HP Compaq dc7800 Small Form Factor PC] suspend/resume failure
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
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<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/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>urs_fleisch@yahoo.de
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Suspend to RAM fails, the PC will not wake up again. It only works if I suspend
to disk before, then I can suspend to RAM afterwards (as many times as needed)
until the PC is rebooted again.
The suspend to disk workaround no longer works on Ubuntu 15.10, but it still
works with Arch Linux and it worked with all Ubuntu versions I had on this PC,
i.e. Ubuntu 11.10, 12.04, 12.10, 13.04, 13.10, 14.04, 14.10, 15.04. I think
this information is still important as it shows that the PC can be brought into
a state where suspend to RAM works.
Another observation: The PC can resume from suspend to RAM if nomodeset is
added to the kernel cmdline, in which case,the screen isn't turned on after
resume but the PC reacts to keyboard and is able to reboot with ctrl-alt-del.
I reported this bug initially to Ubuntu at
<a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1375995">https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1375995</a>, where it was
triaged to be a kernel bug <a href="https://bugzilla.kernel.org/show_bug.cgi?id=109811">https://bugzilla.kernel.org/show_bug.cgi?id=109811</a>,
where they said this is a GPU driver issue. You can find additional information
in these two bug reports.
I checked if any remarkable differences between the state of Intel registers
can be observed (using intel_reg dump) in the case after reboot (where STR
fails) and the case after hibernation (where STR works), however, I could not
find any. Please tell me, if I can check anything else.</pre>
</div>
</p>
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