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  • A/V problems while the Pi is doing nothing

    From Jim Diamond@3:633/10 to All on Sunday, March 15, 2026 13:30:02
    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)
  • From ottitale@3:633/10 to All on Sunday, March 15, 2026 07:29:25
    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)
  • From Lawrence D?Oliveiro@3:633/10 to All on Monday, March 16, 2026 10:00:02
    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)
  • From Jim Diamond@3:633/10 to All on Monday, March 16, 2026 10:00:02
    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)
  • From ottitale@3:633/10 to All on Monday, March 16, 2026 03:10:03
    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.




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