Trending Lyricist I

Multichannel PCM 5.1 dropping out since 14.10 update

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Anyone else experiencing the same issue? Multichannel PCM 5.1 blanks out for a second every 1-2 minutes. I don’t think it’s a bandwidth issue as it works flawlessly with Multichannel PCM 7.1 (thorough test) and Dolby TrueHD Atmos (quick test). And it may have been caused by the Sonos 14.10 update. Setup is PS5→ LG C1→ Beam 2 (via earc).

2 weeks ago before the 14.10 update, I watched a bluray film wherein I had my PS5 transcode the DTS-HD MA 5.1 audio to Multichannel PCM 5.1 (as the C1 does not support DTS) and had no issues. Earlier today, I played a bluray film for the first time in 2 weeks and I encountered consistent audio dropouts every 1-2 minutes. It had the same setup where DTS-HD MA 5.1 → Multichannel PCM 5.1. I tested other bluray discs including the one I watched 2 weeks ago and they all now have the same issue.

Curiously, I’ve been gaming heavily on my PS5 the past two 2 weeks and haven’t had any audio issues. Then I realized that I’ve been using Multichannel PCM 7.1 when gaming on my PS5. So I made some changes under the PS5 sound settings to make it output Multichannel PCM 5.1 instead. Lo and behold, I am now getting the same consistent dropouts in games and even on the PS5 main menu.

I think it’s due to the Sonos 14.10 update as that’s the only firmware update I’ve done in the last 2 weeks. No PS5 update, no LG C1 update. Well actually while I was composing this post, I received and applied the latest LG C1 firmware update and I still have the same issue.

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Pinned Reply By Corry P

Hi @throwawaybeam2 et al

We now recommend you reach out to the TV manufacturer (LG) as this behaviour is also occurring with different soundbar manufacturers (so it’s not a Sonos-specific issue).

Alternatively, please utilize different audio formats from McLPCM 5.1 (e.g., McLPCM 7.1, DD+, etc).

I hope this helps.

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ste_ms

Enthusiast I

When I’m on my ps5 and audio is playing, I turn on my Apple TV (without switching to its source) and the moment it turns on, the audio cuts, just as it does regularly. It returns moments later.

I can repeat this behaviour, as you say it does sound exactly like the regular audio drops. I pulled the power on the ATV a few seconds after the PCM 5.1 dropped on the active HDMI port. There were 3 short audio drops whilst the ATV booted and then the next scheduled dropped occurred at 59 seconds. I’ll try with the A1 next time I have access to the HDMI ports.

Also, I managed to trap the bug into a single HDMI port. Further to observing the PS5 was bugged and the ATV wasn’t, I then repeatedly swapped the HDMI cables between ports 1 and 3 at the TV end. It didn’t matter which device was playing on port 3, it was the bugged one. HDMI 1 also continued without dropouts, regardless if the source device was PS5 or the apple TV. Suggests the C1 isn’t blameless?

C1 firmware updated to 3.34.70, no change in audio drops.

I also sacrificed a “high speed with ethernet” HDMI cable and cut what I think is pin 13 (CEC), but whilst the HDMI 2 video is intact, and I’m now able to de-activate CEC (the remote also stays working), the TV doesn’t engage either eARC or ARC and audio is limited to the TV speaker. I cut the red wire - maybe I should have cut blue 😬

What you’re saying is interesting. For me the ATV is on HDMI 1 and I don’t have sound drops (although it’s usually playing Atmos or stereo content), and the Switch is on HDMI 3 and the PS5 on HDMI 4.

Perhaps it’s HDMI 3 and 4 only which are bugged…

Anyway it’s looking like something with some kind of device polling every 59 seconds.

The problem has always been my ATV on HDMI3, the PS5 on HDMI1 is fine. I had previously moved the ATV to HDMI4 but that never fixed it.

Perhaps the HDMI sockets are split into 2 banks somehow with the Beam being on the HDMI 1 and 2 ‘bank’ due to ARC being HDMI2? Then perhaps it is some kind of interrupt from the 3/4 bank that is causing the issue? I still can’t work out why the Arc would be unaffected though

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RANDUSR23296

Enthusiast I

Perhaps the HDMI sockets are split into 2 banks somehow with the Beam being on the HDMI 1 and 2 ‘bank’ due to ARC being HDMI2? Then perhaps it is some kind of interrupt from the 3/4 bank that is causing the issue? I still can’t work out why the Arc would be unaffected though

I’m convinced that one of the first things I did when I first noticed the bug was switch between HDMI 1 and 3. At the time though I didn’t consider using two 5.1 devices, just switching between 7.1 and 5.1 on the same device. That was also when the drops were 39 seconds apart. Maybe some LG firmware update shuffled some HDMI chipset contention around to “fix” HDMI 1, at the expense of HDMI 3 getting worse…

I cannot find much on the internet about the HDMI chipsets, other than the C9 is apparently based on a custom design by Synopsis called Hawk 2. I would expect most smaller devices to use COTS parts, but I guess LG does have the economies of scale to step up to an ASIC/FPGA implementation.

O

OmriP

Lyricist III

When I’m on my ps5 and audio is playing, I turn on my Apple TV (without switching to its source) and the moment it turns on, the audio cuts, just as it does regularly. It returns moments later.

I can repeat this behaviour, as you say it does sound exactly like the regular audio drops. I pulled the power on the ATV a few seconds after the PCM 5.1 dropped on the active HDMI port. There were 3 short audio drops whilst the ATV booted and then the next scheduled dropped occurred at 59 seconds. I’ll try with the A1 next time I have access to the HDMI ports.

Also, I managed to trap the bug into a single HDMI port. Further to observing the PS5 was bugged and the ATV wasn’t, I then repeatedly swapped the HDMI cables between ports 1 and 3 at the TV end. It didn’t matter which device was playing on port 3, it was the bugged one. HDMI 1 also continued without dropouts, regardless if the source device was PS5 or the apple TV. Suggests the C1 isn’t blameless?

C1 firmware updated to 3.34.70, no change in audio drops.

I also sacrificed a “high speed with ethernet” HDMI cable and cut what I think is pin 13 (CEC), but whilst the HDMI 2 video is intact, and I’m now able to de-activate CEC (the remote also stays working), the TV doesn’t engage either eARC or ARC and audio is limited to the TV speaker. I cut the red wire - maybe I should have cut blue 😬

What you’re saying is interesting. For me the ATV is on HDMI 1 and I don’t have sound drops (although it’s usually playing Atmos or stereo content), and the Switch is on HDMI 3 and the PS5 on HDMI 4.

Perhaps it’s HDMI 3 and 4 only which are bugged…

Anyway it’s looking like something with some kind of device polling every 59 seconds.

The problem has always been my ATV on HDMI3, the PS5 on HDMI1 is fine. I had previously moved the ATV to HDMI4 but that never fixed it.

Perhaps the HDMI sockets are split into 2 banks somehow with the Beam being on the HDMI 1 and 2 ‘bank’ due to ARC being HDMI2? Then perhaps it is some kind of interrupt from the 3/4 bank that is causing the issue? I still can’t work out why the Arc would be unaffected though

This is my best guess as well.

It has gotten noticeably worse since the last few updates too.

E

Elvis33

Lyricist II

Adjunto la información que me da la aplicación Sonos

Esto es correcto. Si no te haces problemas quedate con esto.

Pues tengo cortes, lamentablemente tengo corte de audio cada minuto es muy molesto así que tendré que pasar Dolby digital de momento..

Así es, aquí desde México y con el mismo problema. Lo que impide jugar Nintendo Switch de manera envolvente, ya que Nintendo es tan avara que no paga licencias de Dolby ni de DTS. Y la única manera seria LPCM 5.1 y desgraciadamente, sufrimos de estos cortes tan molestos. Llegaremos a 300 - 500 comentarios y Sonos no resolverá esto? Decepcionante.

O

OmriP

Lyricist III

I’m hearing a lot of people talking about updating the TV firmware to the newest version from the Korean website. Is that safe for a European model? And how is it done?

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PhaseModS

Lyricist III

Just a heads up, an easy way to test this is with a switch. It only outputs 5.1 pcm surround sound (besides stereo & mono) as far as I know. It’ll sometimes work for a week, start dropping out , I’ll tinker, it’ll work again for a limited time. Sometimes only on one HDMI port, makes no sense.

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ste_ms

Enthusiast I

I wouldn’t have expected it this quickly but todays 15.1.1 update doesn’t fix it

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xlcoolj

Contributor II

Dunno why but LG C2 turned on AMD Free Sync . Had no pauses for 5 days. On multichannel pcm 5.1.Just updated to 15.1.1 and now is started again. Am so pissed 😤

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Xassefras

Lyricist II

I thought it was just me, so I’m very glad to have found this topic. I also have a Sonos Beam Gen 2, hooked up to an LG C1 and the audio just keeps cutting out when using my Nintendo Switch in surround mode (LPCM 5.1). It’s really a bummer because I would like to get two One’s as surround speakers, but I have decided to hold off on buying new Sonos gear until this issue has been resolved.

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Hawk780

Lyricist III

I am having this same issue and it has been going on for months. This is specifically woth my switch which can only do pcm 5.1.

To further reinforce some other people's notes - this problem only occurs on my switch which is on hdmi 4. Same issue with hdmi 3. But like other people said - hdmi 1 did NOT have this issue when I tried the switch on that. Hdmi 2 is the earc so can't use that one.

What is going on here? I really want to use my surrounds but the constant sound cut off is driving me nuts. My hdmi 1 is for my ps5 and don't want to be limited to one hdmi. This did not always used to happen so it's very frustrating.

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