[Bug 109509] New: Loss of i915 (Gemini Lake) HDMI audio after turning off and on AVR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109509

            Bug ID: 109509
           Summary: Loss of i915 (Gemini Lake) HDMI audio after turning
                    off and on AVR
           Product: DRI
           Version: XOrg git
          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: memphiz at kodi.tv
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Basically my issue reads very very similar to the one from bug id 104952.

I am running Ubuntu 18.04.1 LTS on an Gigabyte Prix GB-BLPD-5005 (Intel Pentium
J5005 Gemini Lake). Running mainline kernel:

Linux brix 4.20.5-042005-generic #201901260434 SMP Sat Jan 26 09:36:17 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux

I have attached a Yamaha AVR via HDMI and after that a Samsung TV:

Whenever I switch off the AVR and turn it back on after some longer time (> 60
seconds or a couple of minutes - not tested that much yet) - I loos HDMI audio
and have the following messages in dmesg:

[52092.976001] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, switching
to polling mode: last cmd=0x20bf8100
[52093.983688] snd_hda_intel 0000:00:0e.0: No response from codec, disabling
MSI: last cmd=0x20bf8100
[52094.988008] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, switching
to single_cmd mode: last cmd=0x20bf8100
[52095.272444] snd_hda_codec_hdmi hdaudioC0D2: Unable to sync register
0x2f0d00. -5

For getting HDMI audio restored I need to shutdown X and unload/reload
snd-hda-intel.

Please advice what kind of debug logs are needed for investigation and I will
happily provide them.

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