[RPi5] GUI colors and resolution problem

    I have noticed some strange behavior with my new LibreELEC setup when playing 4K content:

    1. During boot, the LibreELEC splash screen appears in the top-left corner and occupies only about one quarter of the display.
    2. The GUI colors change whenever I open my projector’s on-screen menu. While the projector menu is active, all text and icons become noticeably whiter and actually look better.
    3. I need to set the maximum resolution manually in the display settings. If I set the GUI to 1080p, enable the 4K modes in the whitelist, and configure the player to adjust the display refresh rate to match video playback (on start/stop), the intention is to keep the GUI at 1080p and switch to 4K for movies. However, when doing this, the image again shows up in only about one quarter of the screen.

    I have already tried resetting /storage/.kodi/userdata/guisettings.xml and forcing a new one, but it didn’t help. This is a fresh Raspberry Pi 5 installation, but I restored a backup from my previous Pi 4 to keep all apps and configuration.

    Do you have any idea what might be causing this? I would appreciate any clues on where to investigate.

    video=HDMI-A-1:1920x1080M@60D

    Add that ^ to boot params in cmdline.txt and the initial DRM state is forced to 1080p and that should stop the image being in 1/4 of the screen?

    The colour change is probably the projector switching itself to a different RGB output mode. It’s nothing that LE/Kodi can control.

    I think it has been always 1080p and that is the reason. It is connected to 4k projector so it is then just 1/4 of scree. When I applied your suggestion the booting logo was the same and then the gui sticked to it (1/4). I had to move panes to make it fullscreen again. Doing it all I selected 1080p as a GUI resolution but while playing the 4k movie it is only 1/4 of the screen. So not changes in general.