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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 - DP MST: wrong device names in /sys/class/drm"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84717">84717</a>
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<th>Summary</th>
<td>DP MST: wrong device names in /sys/class/drm
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg CVS
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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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
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>dev@blackamp.de
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>With latest version of the intel driver
(ec2b9ac81aed0d2dda2948171ca1c260184bf221) I find the MST devices correctly
named (DP2-subid) in xrandr:
# xrandr|grep connected
eDP1 connected 1920x1080+0+1080 (normal left inverted right x axis y axis)
309mm x 175mm
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm
x 299mm
DP2-2 connected 1200x1600+1920+0 left (normal left inverted right x axis y
axis) 432mm x 324mm
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
However in /sys/class/drm the folders follow the old naming scheme:
# ls /sys/class/drm/
card0 card0-DP-1 card0-DP-2 card0-DP-3 card0-DP-4 card0-DP-5 card0-eDP-1
card0-HDMI-A-1 card0-HDMI-A-2 controlD64 renderD128 version
I am not sure as of yet whether the mapping between the continuous numbers and
the MST devices is persistent. I would have expected to find the same naming
used in /sys/class/drm as I found in xrandr. Please let me know what additional
information to supply.</pre>
</div>
</p>
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