[Bug 84717] New: DP MST: wrong device names in /sys/class/drm

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84717

            Bug ID: 84717
           Summary: DP MST: wrong device names in /sys/class/drm
           Product: DRI
           Version: XOrg CVS
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dev at blackamp.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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.

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