Cant change screen refresh rate on a gaming laptop

[Olli]

install optimus-manager and use the following instructions:

Connecting external display to laptop

inxi --admin --verbosity=7 --filter --no-host --width  0|1 ✘  3s  System: Kernel: 5.15.41-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 12.1.0 parameters: BOOT_IMAGE=/boot/vmlinuz-5.15-x86_64 root=UUID=b0c1b620-4a51-4d52-983b-e9774711e237 rw acpi_backlight=vendor quiet apparmor=1 security=apparmor udev.log_priority=3 amdgpu.backlight=0 Desktop: KDE Plasma v: 5.24.5 tk: Qt v: 5.15.4 info: latte-dock wm: kwin_x11 vt: 1 dm: SDDM Distro: …