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  • xset dpms force off not working 4.3inch DSI LCD

    From Dr Stephen Strange@3:770/3 to All on Tue Aug 8 13:39:22 2023
    I have a 4.3inch DSI LCD fro Waveshare. If you want to see the home page
    it is here

    https://www.waveshare.com/wiki/4.3inch_DSI_LCD?Amazon

    I am trying to blank the screen remotely via SSH and the instructions
    say use

    xset dpms force off

    However this results in the error xset: unable to open display ""

    Any ideas??

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From Andy Burns@3:770/3 to Dr Stephen Strange on Tue Aug 8 13:52:34 2023
    Dr Stephen Strange wrote:

    xset dpms force off

    Any difference if you use an explicit display number? e.g

    xset -display :0.0 dpms force off
    xset -display :1 dpms force off

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From Dr Stephen Strange@3:770/3 to Andy Burns on Tue Aug 8 14:07:32 2023
    Andy Burns wrote:
    Dr Stephen Strange wrote:

    xset dpms force off

    Any difference if you use an explicit display number? e.g

    xset -display :0.0 dpms force off
    xset -display :1 dpms force off

    using the first one I get - server does not have extension for dpms option xset: unknown option force

    And using the second I get - xset: unable to open display ":1"

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From The Natural Philosopher@3:770/3 to Dr Stephen Strange on Tue Aug 8 15:55:02 2023
    On 08/08/2023 13:39, Dr Stephen Strange wrote:
    I have a 4.3inch DSI LCD fro Waveshare. If you want to see the home page
    it is here

    https://www.waveshare.com/wiki/4.3inch_DSI_LCD?Amazon

    I am trying to blank the screen remotely via SSH and the instructions
    say use

    xset dpms force off

    However this results in the error xset:  unable to open display ""

    Any ideas??
    wild guess:

    sudo xset dpms force off

    --
    "Nature does not give up the winter because people dislike the cold."

    ― Confucius

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From Dr Stephen Strange@3:770/3 to The Natural Philosopher on Tue Aug 8 16:00:22 2023
    The Natural Philosopher wrote:
    sudo  xset dpms force off

    I tried sudo in fron of all the above commands with the same results

    sudo xset dpms force off gives xset: unable to open display ""

    My skill in these things is limited as you have probaly guessed!!!

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From Lew Pitcher@3:770/3 to Dr Stephen Strange on Tue Aug 8 17:16:07 2023
    On Tue, 08 Aug 2023 16:00:22 +0100, Dr Stephen Strange wrote:

    The Natural Philosopher wrote:
    sudo  xset dpms force off

    I tried sudo in fron of all the above commands with the same results

    sudo xset dpms force off gives xset: unable to open display ""

    My skill in these things is limited as you have probaly guessed!!!

    xset(1) is a utility supplied with and for X11, and requires
    a) running X server,
    b) a known display on that X server, and
    c) permissions to access and modify that display.

    If you try to use xset(1) to blank a screen, you have to specify
    the display that the screen is attached to, and give permission
    (either implicitly, by "owning" that display, or explicitly
    through xauth(1) or another recognized authorization method)
    for the xset(1) client application to access that display.

    All to say that xset(1) is /not/ the best tool to use to blank a
    screen remotely.

    What you likely need is to use vbetool(1) or some other video
    hardware state altering tool (perhaps setterm(1) would do) to
    set the low-level video blanking values.

    HTH
    --
    Lew Pitcher
    "In Skills We Trust"

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From Jan Panteltje@3:770/3 to no.spam@me.com on Wed Aug 9 05:20:13 2023
    On a sunny day (Tue, 8 Aug 2023 14:07:32 +0100) it happened Dr Stephen Strange <no.spam@me.com> wrote in <lFudnbNQIb-Jo0_5nZ2dnZfqnPqdnZ2d@brightview.co.uk>:

    Andy Burns wrote:
    Dr Stephen Strange wrote:

    xset dpms force off

    Any difference if you use an explicit display number? e.g

    xset -display :0.0 dpms force off
    xset -display :1 dpms force off

    using the first one I get - server does not have extension for dpms option >xset: unknown option force

    And using the second I get - xset: unable to open display ":1"

    Seem dpms is not supported

    How about
    To stat screen saver on one second
    xset -display :0.0 s 1

    To set timout screen saver to 1000 seconds and disable it
    xset -display :0.0 s 1000 s reset

    See man xset

    I am not sure that if some thing like mplayer is running it will blank
    Also dpms may switch the backlight of the LCD off?
    Does xset s do that ?
    But just to blank against burnin this may work.

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)