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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [KBL] Distortion Noisy Audio when continuously resolution changed on DisplayPort..."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=105848">105848</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[KBL] Distortion Noisy Audio when continuously resolution changed on DisplayPort...
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>DRI git
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>sriramx.periyasamy@intel.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>i915 platform</th>
          <td>KBL
          </td>
        </tr>

        <tr>
          <th>i915 features</th>
          <td>display/audio
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=138493" name="attach_138493" title="The Zip contains logs and patches.">attachment 138493</a> <a href="attachment.cgi?id=138493&action=edit" title="The Zip contains logs and patches.">[details]</a></span>
The Zip contains logs and patches.

Bug description:

System environment:
-- chipset: Kabylake
-- system architecture: 64-bit
-- xf86-video-intel: compiled for 1.18.4, module version = 2.99.917
-- xserver: 1:7.7+13ubuntu3
-- mesa: OpenGL version string: 3.0 Mesa 11.2.0
-- libdrm: 2.4.83-1~16.04.1
-- kernel: 4.16.0-rc7
-- Linux distribution: Ubuntu 16.04.1 LTS
-- Machine or mobo model: Intel Corporation Kabylake Client platform/Skylake Y
LPDDR3 RVP3
-- Display connector: Display Port

Reproducing steps:

- Connect Display Port monitor to the device
- Boot the testing device
- Choose the Display Port output device in sound settings as
  "HDMI/Display Port 2 Stereo" 
- Play any 48 KHz, 2 Ch, 16 bit using the music player
- Go to display settings
- Change the monitor resolution continuously ( Especially change across
1280x1024, 1280x720 )
- At some point, distorted noisy audio will be heard on DP monitor.

Recovery :

- To change to some other resolution again.

Probability :

- In average, the issue can be reproduced at 3 - 5 mins. If you are lucky, the
issue may come quickly. Disabling the DRM logs enables the reproducibility of
the issue easier.

Additional info:

- The issue can be reproduced consistently at two resolutions 1280x1024,
1280x720.

- Two patches from Skylake audio drivers are taken to reproduce the issue

 0001-ASoC-hdac_hdmi-WA-to-allow-Jack-report.patch - WA patch to enable the
sequence of resolution change since PulseAudio is not properly stopping and
starting the stream.
 0002-ASoC-Intel-Skylake-Reset-stream-to-link-mapping.patch - Fix for the
proper stream to link mapping in Skylake audio controller.

- Attached the dmesg and intel_audio_dump info on the problematic and
non-problematic cases.</pre>
        </div>
      </p>


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