'Re: [Xen-users] Fwd: Audio not working: "snd_hda_intel: No response from codec, resetting bus"'

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List:       xen-users
Subject:    Re: [Xen-users] Fwd: Audio not working: "snd_hda_intel: No response from codec, resetting bus"
From:       Claudia <csp5595 () vfemail ! net>
Date:       2019-11-22 23:22:04
Message-ID: cd7fd10a-dcf6-82da-b274-2d7c9b05b8b5 () vfemail ! net
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Claudia:
> (cc xen-users; see original message below)
> 
> So I was able to boot Qubes as a regular kernel, without Xen, and the 
> codec is properly detected as Realtek ALC3234. Same exact kernel, same 
> commandline, same userspace, just without Xen. (Xen 4.8.5-11.fc25)
> 
> Any ideas on what might be causing this, or how to debug further?
> 
> Here's some useful information I found on snd_hda_intel:
> https://help.ubuntu.com/community/HdaIntelSoundHowto#Playing_with_probe_mask 
> 
> https://www.kernel.org/doc/html/v4.18/sound/hd-audio/notes.html#codec-probing-problem 
> 
> https://www.kernel.org/doc/html/v4.18/sound/alsa-configuration.html#module-snd-hda-intel 
> 
> 
> Note: I found a *lot* of info telling me to set the model= parameter, 
> however the documentation states that model is specific to the codec 
> driver, e.g. snd_hda_intel_realtek. The problem here is that 
> snd_hda_intel cannot even detect the make/model of the codec chip, and 
> thus the realtek driver doesn't even get loaded under Xen. Just in case, 
> I tried several model= options, including model=auto, and none of them 
> had any effect.
> 
> -------- Forwarded Message --------
> Subject: Audio not working: "snd_hda_intel: No response from codec, 
> resetting bus"
> Date: Wed, 13 Nov 2019 19:11:55 +0000
> From: Claudia <csp5595@vfemail.net>
> To: qubes-users <qubes-users@googlegroups.com>
> 
> Audio works fine in Fedora 25-1.3 livecd and codec is detected as 
> "ALC3234 Analog", alsa version k4.8.6-300.fc25.x86_64. It also works in 
> F30.
> 
> On Qubes 4.0.2-rc2, I can't get audio to work at all. Codec shows up as 
> "Generic Analog" in `aplay -l`, in alsamixer chip (codec) is "Generic 
> ffff Generic", and kernel logs show
> 
> snd_hda_intel 0000:03:00.1: no codecs initialized
> snd_hda_intel 0000:03:00.6: azx_get_response timeout, switching to 
> polling mode: last cmd=0x000f0000
> snd_hda_intel 0000:03:00.6: No response from codec, disabling MSI: last 
> cmd=0x000f0000
> snd_hda_intel 0000:03:00.6: Codec #0 probe error; disabling it...
> snd_hda_intel 0000:03:00.6: No response from codec, resetting bus: last 
> cmd=0x000f0000
> 
> ... followed by a stack trace.
> 
> 0000:03:00.6 is the speaker/headphone interface, and .1 is HDMI. I'm not 
> concerned with HDMI at the moment.
> 
> I get a variety of different errors from aplay in dom0, or it just hangs 
> indefinitely; it seems random. And I obviously can't hear anything 
> playing in VMs.
> 
> ALSA version is k4.19.81-1.pvops.qubes.x86_64
> 
> I tried playing around with some modprobe options, such as probe_mask=1, 
> probe_mask=8, model=auto, and index=1, but none of them get rid of the 
> errors or cause the codec to be detected as anything other than "Generic 
> Analog".
> 
> I get the same result when booting Qubes with VT-x and VT-d disabled. I 
> also tried booting the Qubes installer, but it appears the installer 
> doesn't attempt to load any sound drivers (no success or failure 
> messages) and it doesn't appear to have alsa-utils.
> 
> Any idea why audio would work in Fedora 25 with 4.8.6, but not Qubes 
> R4.0.2 with 4.18.81?

As a workaround, I was able to get Xen to detect the codec and get rid 
of the error by using single_cmd=1. However the snd_hda_intel 
documentation warns that single_cmd is meant for debugging purposes only 
and is generally not recommended.

However, even with the error gone and the codec driver loading now, I 
still can't get any sound in Xen, even after reordering the cards, 
disabling the HDMI card, trying various model= options, disabling power 
save, and trying speaker-test with pulseaudio disabled. At best I get a 
quiet static from headphones, and can hear a slight pop when the channel 
is unmuted. Additionally, speaker-test and aplay occasionally seem to 
hang indefinitely, as if the device is blocking, but not always. Audio 
works fine using the same configuration when booted without Xen.

So, to recap what I've found so far:
Fedora 25 live cd: works
Qubes without Xen: works
Qubes with Xen: codec probe error
Qubes with Xen, VT-x & VT-d disabled: codec probe error
Qubes with Xen, single_cmd=1: codec detected, but no sound

I suppose I could try installing F25 with Xen and see if I get sound. 
But I'm pretty well convinced it's Xen (not Qubes) at this point.

I tried pci=noacpi but the keyboard wouldn't work, so I couldn't test 
sound. The console said something about "couldn't find IRQ ... please 
try using pci=biosirq". Exact same result when I replaced it with 
acpi=noirq. pci=biosirq had no effect as far as I could tell.

I don't know what else to try at the moment. Any ideas would be highly 
appreciated.

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