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Re: A/V problems while the Pi is doing nothing

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Jim Diamond <zsd@jdvb.ca> at 15.3.2026, 21:51:44 "A/V problems while the 
Pi is doing nothing":
> On 2026-03-15 at 03:29 ADT, ottitale <ottitale@o2mail.de> wrote:
>> Jim Diamond <zsd@jdvb.ca> at 14.3.2026, 23:57:15 "A/V problems while the
>> Pi is doing nothing" :
>>
>>> I have a RPi5 hooked up to a TV, and I watch movies or TV programs or what
>>> have you by streaming them on the Pi and sending them to the TV via HDMI.
>>>
>>> I assume this is something that most of you have done at some point.
>>>
>>> I turn the TV off (really it goes into its low power mode) and leave the
>>> RPi on.
>>>
>>> Occasionally, when I turn the TV on to watch something, there are two
>>> things wrong:
>>> (1) The video no longer matches the TV screen size (1920x1080 in this case).
>>>       The video is slightly larger, in that the edges of the picture are
>>>       off-screen.
>>> (2) The sound is no longer coming through the HDMI (or, at least, the TV
>>>       remains silent).
>>>
>>> I can get things working again by running the command
>>>           xrandr --size 800x600  ;  sleep 1 ; xrandr --size 1920x1080
>>> (I have no idea why this gets the sound working.)
>>>
>>> Having a work-around is fine, but I'm wondering if anyone else has seen
>>> this issue.  I don't know whether it is
>>> -> a Pi hardware issue
>>> -> a Pi software issue, or
>>> -> a glitch in my TV (Sony Bravia, FWIW).
>>>
>>> Anyone?
>>
>> This problem occurs when there is a conflict with CEC. The Pi then
>> disables CEC for HDMI. The TV get no Information -> Standard values that
>> do not fit.
> 
> Hmmm... CEC conflicts are a new one for me.
> 
> The Pi and the TV are the only devices in the vicinity (and thus the Pi is
> the only HDMI input for this TV).  Is there a possible CEC conflict in this
> case?
> 

Yes, the TV needs a signal to informa pi that CEC is on, pi wants this 
signal but if no signal is detected the CEC is changed to "off".

There are some packages for CEC to start a cron to activate CEC again.

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A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-14 19:57 -0300
  Re: A/V problems while the Pi is doing nothing ottitale <ottitale@o2mail.de> - 2026-03-15 07:29 +0100
    Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-15 17:51 -0300
      Re: A/V problems while the Pi is doing nothing ottitale <ottitale@o2mail.de> - 2026-03-16 03:10 +0100
        Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-16 13:54 -0300
  Re: A/V problems while the Pi is doing nothing Andy Burns <usenet@andyburns.uk> - 2026-03-15 10:53 +0000
    Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-15 17:54 -0300
      Re: A/V problems while the Pi is doing nothing Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-15 22:18 +0000
        Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-16 13:56 -0300
          Re: A/V problems while the Pi is doing nothing Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-16 22:54 +0000
            Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-17 17:59 -0300
        Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-17 17:57 -0300
      Re: A/V problems while the Pi is doing nothing The Natural Philosopher <tnp@invalid.invalid> - 2026-03-16 12:41 +0000
        Re: A/V problems while the Pi is doing nothing Jim Diamond <zsd@jdvb.ca> - 2026-03-17 17:59 -0300

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