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?

Jim

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

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.



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

On Sun, 15 Mar 2026 17:54:46 -0300, Jim Diamond wrote:

On 2026-03-15 at 07:53 ADT, Andy Burns <usenet@andyburns.uk> wrote:

sounds like the TV is selecting overscan mode, does its remote have
an aspect ratio button, there's usually an option for "exact scan"
or "pc mode"

Nope, nothing "fancy" on the remote like that. For better or worse.

Typically the remote will give access to various menus on the TV. The
necessary setting could be buried in one of those.

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

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?

Jim

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

On 2026-03-15 at 19:18 ADT, Lawrence D?Oliveiro <ldo@nz.invalid> wrote:

On Sun, 15 Mar 2026 17:54:46 -0300, Jim Diamond wrote:

On 2026-03-15 at 07:53 ADT, Andy Burns <usenet@andyburns.uk> wrote:

sounds like the TV is selecting overscan mode, does its remote have
an aspect ratio button, there's usually an option for "exact scan"
or "pc mode"

Nope, nothing "fancy" on the remote like that. For better or worse.

Typically the remote will give access to various menus on the TV. The necessary setting could be buried in one of those.

I didn't find any options with names like that, but buried 5 or 6 levels
deep I did find some options that may keep the TV from changing.

One of them was something like "exact pixel" and the other was a setting
for whether I wanted "full", "wide", and a couple of other choices. I
changed them from "auto" and I'll see what happens.

Thanks again for that suggestion.

Jim

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