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rraub
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14 Messages

Tuesday, April 7th, 2026 11:12 PM

XG1v4-A

Will you please provide instructions how to disable “fast start” / quick boot on an Xfinity XG1v4-A?

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11 hours ago

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XfinityRaf

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2 days ago

Good afternoon @rraub. Can you provide some more details on what you are requesting? 

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rraub

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I am experiencing a conflict between an XG1v4-A and a Sony television.

Even with Stereo/PCM explicitly selected on both devices (ruling out Dolby wrapping or format mismatch), the Sony TV’s HDMI input can partially detect the cable box as an “audio system” during cold boot or random power cycles. This silently switches the TV’s internal speakers to “Audio System” mode (muting them) without any on-screen indication. Video passes fine because it’s independent; the audio negotiation or speaker selection fails only some of the time. Power cycling or a Comcast resets force a clean re-handshake, which is why they give temporary relief but they do not permanently resolve the problem.

I’ve disabled the  Bravia Sync Control for HDMI on the TV, I have disabled HDMI Control on the XG1v4-A, I have forced TV Speakers on the TV, but this has not solved the problem.

I need to change the power on sequence so that the TV turns on, waits 20-30 seconds and then turns on the XG1v4-A.

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2 days ago

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XfinityRaf

Official Employee

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Thanks for those additional details. I've not come across any settings on our current boxes that change how long it takes the box to boot. Is that the only workaround?

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2 days ago

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rraub

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That is the only workaround of which I am aware.

I invite you to inspect my account stats to see the number of times each day that I request a refresh of the XG1v4-A.

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2 days ago

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XfinityLinda

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@rraub That is quite interesting, and we appreciate you sharing here for the benefit of our community. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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2 days ago

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BIslander

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18 hours ago

@rraub  I've never seen anything like what you describe here or on other AV sites.  Certainly sounds like a Sony TV issue.   It's hard to imagine how a TV set to use its own speakers with HDMI-CEC turned off would switch to external speakers based on a command from the X1 box.  You can try getting a CEC blocker, about $20 on Amazon, which prevents any communication on pin 13, which is how CEC messages are sent. 

(edited)

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rraub

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Thank you for your comments.

I tried an HDMI CEC less adapter without success.
Even with Stereo/PCM explicitly selected on both devices (ruling out Dolby wrapping or format mismatch), the Sony TV’s HDMI input can partially detect the cable box as an “audio system” during cold boot or random power cycles. This silently switches the TV’s internal speakers to “Audio System” mode (muting them) without any on-screen indication. Video passes fine because it’s independent; the audio negotiation or speaker selection fails only some of the time. Power cycling or Comcast resets force a clean re-handshake, which is why they give temporary relief. The CEC-less adapter often doesn’t fully block the problematic EDID/speaker-detection signals on this exact set top box and TV combo. Moreover, it can even introduce its own subtle timing issues.

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17 hours ago

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BIslander

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14 hours ago

@rraub OK.  The CEC blocker prevents CEC messaging by disabling the physical pin.  So, this cannot be a CEC issue.  

How can the audio transmission setting on either device (stereo/PCM or any flavor of Dolby) cause that behavior?

How did you decide the Sony TV detects the X1 as an Audio System and switches from internal to external speakers as a result?  X1 is not an ARC device.  

(edited)

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BIslander

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11 hours ago

Thanks for the added info.  Interesting.  Did the Sony people explain how they came to that conclusion? 

It sounds like you are saying the problem happens when the TV and X1 both power up at the same time.  Have you confirmed that (A), if both are powered down, the audio is fine if you turn on the TV with its remote and then wake up the X1 more than :30 later?  Or that (B), audio is fine if the cable box is already running when you power up the TV with its own remote?

As you can probably gather, I am skeptical that powering up the X1 and TV together is causing the speaker problem you are having.   Lots and lots of people have Sony TVs and XG1v4 boxes and I've never seen a post like yours.  I have LGs, Samsungs, and Panasonics paired with various Xfinity boxes and have never had my TVs do what you describe.

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