BBS:      TELESC.NET.BR
Assunto:  Re: A/V problems while the Pi is doing nothing
De:       Jim Diamond
Data:     Mon, 16 Mar 2026 10:00:02 +1100
-----------------------------------------------------------
On 2026-03-15 at 03:29 ADT, ottitale  wrote:
> Jim Diamond  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?

                                Jim

--- PyGate Linux v1.5.13
 * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

-----------------------------------------------------------
[Voltar]