Force output resolution at bootup

  • Hello,

    now i have the edid.bin file.

    i want to change 1920x1080@60hz to 1920x1080@50hz.

    how do i do this?

    On windows i just use "Custom Resolution Utility" to add 1920x1080@50hz, and it works perfect with this device.


    And another question: Amlogic (Legacy)

    Does that mean, brand new amlogic hardware + brand new libre/coreelec, it isnt possible anymore to "force" a refresh rate?

    Edited once, last by wedok (September 22, 2025 at 1:43 PM).

  • Code
    video=HDMI-A-1:1920x1080M@50D

    On devices that boot a modern Linux kernel append this ^ to kernel boot params and the HDMI connector will be forced to that resolution/refresh on boot. This applies to AMLGX images too. I've no idea about CE images (as never used them).

  • Yeah, now im at the point where i use the edid of my samsung tv with the integrated panel of a wyse aio thin client.

    i only use the 50 and 60 hz settings (there are more like 24hz, 25hz, 48, etc).

    it was just an experiment but it works!

    (before, on windows i was able to force refresh rate to 50hz with "custom resolution utility (cru)" on the wyse integrated panel too.

    BUT NOW libreelec gui/interface goes black or turns the screen off for a second when the machine "does smthg".

    for example. display is on and when i then hit a key on the keyboard, display goes black for a second.

    another example. display is on and when i then insert usb stick it goes off or turns black for a second.

    Another 1, is the minute of the time changed and screen turned black for a second.

    For me it looks that any kind of change on the libreelec interface causes a "screen resolution" change. :(

    BUT!!! when i playback a video file. screen remains ON till video is stopped.

    Do you have a clue what happens?

    Any way to fix this "screen off" bug?

    I think this is the only last hing that prevents me from using it. :(

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    The "News Scroller" (tagesschau24, video source is 720p@50fps) isnt good in the video but in real it runs completely smooth like on a 50hz tv.

    Edited 5 times, last by wedok (September 22, 2025 at 3:40 PM).

  • The blanking is loss of sync on the HDMI connection. Common causes are using bad HDMI cables, bad HDMI adapters, the HDMI connector (the DRM device in the kernel) being forced to output using a mode that's outside the display device specs (can happen when EDID data is incorrect or has been incorrectly fiddled with), or the hardware being rubbish, and inadequate power supplies.

    In general I would set this:

    • Force the initial DRM state (as above)
    • Set the Kodi desktop to 50Hz
    • Set 'adjust-refresh' in playback options
    • Enable the whitelist and only select 50/60Hz 1080p resolutions
    • Enable rate doubling and 3:2 pulldown

    No idea if that will work though. In general I've always found monitors to be a bit rubbish compared to a proper TV.