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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 - MST monitor doesn't come back from "xset dpms force off""
href="https://bugs.freedesktop.org/show_bug.cgi?id=89453">89453</a>
</td>
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<th>Summary</th>
<td>MST monitor doesn't come back from "xset dpms force off"
</td>
</tr>
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<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>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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>
</tr>
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<th>Reporter</th>
<td>palmer@dabbelt.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=114057" name="attach_114057" title="The log from running "git bisect" between 3.16 and 3.17">attachment 114057</a> <a href="attachment.cgi?id=114057&action=edit" title="The log from running "git bisect" between 3.16 and 3.17">[details]</a></span>
The log from running "git bisect" between 3.16 and 3.17
I have a DisplayPort MST monitor that I have attached to my Mac Book Pro 2014
via a mini DisplayPort to DisplayPort cable. Since 3.16 my monitor doesn't
come back from sleep mode (this can be triggered by "xset dpms force off").
Specifically, I:
* xset dpms force off
* Wait for the monitor to say it's going to sleep and turn the backlight off
* Push a button on my keyboard
* The monitor wakes back up and turns the backlight on
* After a few seconds the monitor goes back into sleep mode, no image is ever
displayed.
During this time, my second monitor (a USB DisplayLink monitor) continues to
work fine. Rebooting fixes the problem, but running "xrandr --output DP2
--off; xrandr --output DP2 --preferred" doesn't help, unplugging and
re-plugging the cable doesn't help, and killing X doesn't help.
I ran a "git bisect" which indicates that
0e32b39ceed665bfa4a77a4bc307b6652b991632 is the problem, but it's too big of a
commit for me to understand, sorry. Attached is the "git bisect" log. I'll be
attaching some other logs, but I'm afraid they're not very useful...
This in still broken on both 3.19 and 99aedde0869ce194539166ac5a4d2e1a20995348
(master from this morning). 4.0-rc2 has other problems, the display doesn't
come up at all.</pre>
</div>
</p>
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