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@PID: PyGate 1.5.13
@TID: PyGate/Linux 1.5.13
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<slrn10rgde0.u07.zsd@x360.localdomain>
On 2026-03-15 at 23:10 ADT, ottitale <
ottitale@o2mail.de> wrote:
> 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.
Thanks for the info. I`ll try tracking this down and see if it has any
effect. Unfortunately (maybe) the problem is quite sporadic, and I don`t
know how to trigger it, so testing whether something fixes it is more
statistical than definitive.
Jim
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