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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 - [KBL] Distortion Noisy Audio when continuously resolution changed on DisplayPort..."
href="https://bugs.freedesktop.org/show_bug.cgi?id=105848">105848</a>
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<th>Summary</th>
<td>[KBL] Distortion Noisy Audio when continuously resolution changed on DisplayPort...
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>sriramx.periyasamy@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>i915 platform</th>
<td>KBL
</td>
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<th>i915 features</th>
<td>display/audio
</td>
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<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>
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</p>
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