[Bug 80434] New: [BYT-M][BDW] Asus PA238Q monitor: there's no DP 48Khz sound output after resume from S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80434

          Priority: medium
            Bug ID: 80434
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT-M][BDW] Asus PA238Q monitor: there's no DP 48Khz
                    sound output after resume from S3
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: libin.yang at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Steps to reproduce:
1. aplay -D hw:0,7 /home/$USER/Music/1_WAV_PCM_48000Hz_stereo_16bit.wav
2. rtcwake -m mem -s 10
3. aplay -D hw:0,7 /home/$USER/Music/1_WAV_PCM_48000Hz_stereo_16bit.wav
Phenomenon:
at step 1: music cat be played successful
at step 3: music was be playing, but no sound output
Note:
The test steps have been run both on ASUS and DELL monitor, but the bug only
appears on ASUS PA238Q monitor, not on DELL.

This issue only happens to ASUS PA238Q monitor's DisplayPort for 48KHz audio.

Reproduced on both Haswell and Broadwell.

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