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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - xrandr --off --> --auto fails to re-enable external (MST) monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89612">89612</a>
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<th>Summary</th>
<td>xrandr --off --> --auto fails to re-enable external (MST) monitors
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Driver/intel
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
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<th>Reporter</th>
<td>tim.besard@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=114389" name="attach_114389" title="dmesg after booting on 3.14 + MST patches, with drm.debug=14">attachment 114389</a> <a href="attachment.cgi?id=114389&action=edit" title="dmesg after booting on 3.14 + MST patches, with drm.debug=14">[details]</a></span>
dmesg after booting on 3.14 + MST patches, with drm.debug=14
I'm using Arch Linux (shipping xf86-video-intel 2.99.917 and xorg-server
1.17.1)
on my T440s with two external Dell 24" monitors connected over both DVI and DP
to a docking station. This specific docking station (official Ultra dock) uses
DP MST to wire the external connections.
When connected to the external displays, I'm not using my laptops screen (lid
closed). I'm configuring my external screens as follows:
$ xrandr --output DP2-2 --auto --output DP2-1 --auto --right-of DP2-2
If I disable my external screens using:
$ xrandr --output DP2-1 --off --output DP2-2 --off
... and I try to revive them afterwards using:
$ xrandr --output DP2-2 --auto --output DP2-1 --auto
xrandr responds with "Configure crtc 1 failed" and both my external screens
refuse to turn on.
I tested this on the 3.19 kernel Arch linux ships, as well as the initial 3.14
+
MST patches from Dave Airlie's git tree, but I'm seeing identical behaviour on
both kernels.
Attached are multiple files:
* dmesg.log: boot-up dmesg on 3.14 with drm.debug-14 (as per Fedora reporting
guidelines)
* dmesg.xrandr.log: relevant drm debug statements from dmesg around the xrandr
commands detailed above
* dri_*_i915_opregion, lspci.log, Xorg.0.log: as per Fedora's guidelines again
* reg_snapshot_*: register snapshots *before* doing anything (laptop screen
off,
both external displays enabled), *after* issuing the "xrandr --off" (and
opening my laptop screen in order to see something), and after trying "xrandr
--auto" and seeing a *failed* message
Note that when I was recording the register snapshots above, and rebooting
after
nuking my external displays with "xrandr --off", I briefly got to see my init
system output on one of my external screens just before the system rebooted.</pre>
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