[Bug 89895] New: [HSW] HDMI/DP audio doesn't work with DP MST

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89895

            Bug ID: 89895
           Summary: [HSW] HDMI/DP audio doesn't work with DP MST
           Product: DRI
           Version: unspecified
          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: freedesktop at h.totakura.in
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi,

I hope this is the right section to report this bug; if not, please redirect me
to the appropriate one.

I am having trouble getting audio via HDMI/DP working.  My setup has a Thinkpad
Ultra dock which has a Synaptics DP MST hub connected to a Dell U2415 monitor
via DP.

`aplay -l' reports:
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: ALC3232 Analog [ALC3232 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

So, the cards are being detected correctly.  However, I do not see that the
monitor is being detected as connected as per ELD, even though I could use the
monitor for video.

$ ls -1 /proc/asound/card0
codec#0
eld#0.0
eld#0.1
eld#0.2
id
pcm3p
pcm7p
pcm8p

$ cat /proc/asound/card0/eld*
monitor_present        0
eld_valid        0
monitor_present        0
eld_valid        0
monitor_present        0
eld_valid        0

Could it be that the DP MST Hub in the dock is misbehaving or not transmitting
ELD?  If so, how can I verify that?

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