Many thanks for that.
I've certainly learnt a lot about the Libreelec display/player settings yesterday which is all good stuff! I have, amongst other things (but mainly), set "adjust refresh" to "on start/stop" and whitelisted most 1080p modes. Presumably that just leaves the display (the Libreelec GUI) in 3840 resolution which does not seem to be a problem. Maybe that's enough?
Sorry but I'm not techie in this regard to know what to do with your suggested commands. I only just "mastered" SSH yesterday! I could try asking my AI but I don't have another day to spend with it for it to eventually admit it's been guessing and lying to me!
OK, I couldn't help myself so asked AI to explain your suggestion and it said something I think I understand......
"This instruction adapts the generic Linux kernel method to force 1080p boot resolution on your LibreELEC AMD NUC setup, overriding the default 4K detection from your display.
Identify Connector
Boot into LibreELEC, enable SSH (Settings > Services), connect via SSH as root. Run tail /sys/class/drm/*/status to find the active HDMI connector (e.g., HDMI-A-1 shows "connected"). AMD APUs use the same DRM naming.github
Boot Files on Installed LibreELEC
Unlike USB, files are on the read-only /flash partition (internal storage). Remount writable: mount -o remount,rw /flash. Edit /flash/syslinux.cfg (BIOS/legacy boot) or /flash/EFI/BOOT/syslinux.cfg (UEFI)—not grub.cfg; LibreELEC generic x86 uses Syslinux/extlinux. Use ls /flash to confirm.libreelec+1
Add Kernel Parameter
In the APPEND or linux line, append video=HDMI-A-1:1920x1080M@60D (replace HDMI-A-1 with your connector). Example: APPEND boot=UUID=... quiet video=HDMI-A-1:1920x1080M@60D. Save with nano, remount read-only (mount -o remount,ro /flash), reboot. Forces kernel framebuffer to 1080p@60Hz on AMD DRM before Kodi loads.reddit+1
Why It Works on AMD NUC
LibreELEC generic x86 supportsThis instruction adapts the generic Linux kernel trick to force a 1080p boot framebuffer on your LibreELEC-installed AMD NUC, overriding the default 4K detection that lags the GUI.
Identify Connector
Boot LibreELEC, enable SSH (Settings > Services), connect as root. Run tail /sys/class/drm/*/status to spot the active HDMI (likely HDMI-A-1 on AMD APUs). Note it exactly.wiki.libreelec
Edit Boot Config
Remount flash writable: mount -o remount,rw /flash. Check ls /flash—edit /flash/syslinux.cfg (legacy BIOS) or /flash/EFI/BOOT/syslinux.cfg (EFI, common on NUCs; not grub.cfg). Use nano to append video=HDMI-A-1:1920x1080M@60D to the APPEND line (swap HDMI-A-1 for yours). Example: APPEND boot=UUID=... video=HDMI-A-1:1920x1080M@60D quiet.github+1
Apply and Test
Save, remount read-only (mount -o remount,ro /flash), reboot. Kernel now initializes DRM at 1080p@60Hz (M=reduced blanking, D=preferred), smoothing boot/GUI on your AMD hardware before Kodi loads. Tweak Kodi resolution afterward if needed".
But is it correct?