Get default graphics configuration from live iso for running system (external usbc display not working; TP P53)

Dear all,

for the life of me I cannot get my external display to work connected to my dual gpu ThinkPad P53 (nvidia/intel). I tried different combinations of nvidia drivers and kernels - to no avail.

When booting the Manjaro live image with non-free drivers (manjaro-kde-21.2.5-220314-linux515.iso) the screen is detected and works as it does under windows and a kubuntu.

Is there a way to get the graphics configuration from the live cd working on my system without reinstalling?

(Of course, if anyone has an idea of how to get the display working otherwise, please share your wisdom).

inxi -Gazy
Graphics:
  Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: Lenovo
    driver: i915 v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20
    ports: active: eDP-1 empty: none bus-ID: 00:02.0 chip-ID: 8086:3e9b
    class-ID: 0300
  Device-2: NVIDIA TU106GLM [Quadro RTX 3000 Mobile / Max-Q] vendor: Lenovo
    driver: nvidia v: 515.65.01 alternate: nouveau,nvidia_drm non-free: 515.xx+
    status: current (as of 2022-08) arch: Turing code: TUxxx
    process: TSMC 12nm built: 2018-22 pcie: gen: 1 speed: 2.5 GT/s lanes: 16
    link-max: gen: 3 speed: 8 GT/s bus-ID: 01:00.0 chip-ID: 10de:1f36
    class-ID: 0300
  Device-3: IMC Networks Integrated Camera type: USB driver: uvcvideo
    bus-ID: 1-8:3 chip-ID: 13d3:56bc class-ID: 0e02 serial: <filter>
  Display: x11 server: X.Org v: 21.1.4 compositor: kwin_x11 driver: X:
    loaded: modesetting gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
    s-diag: 582mm (22.93")
  Monitor-1: eDP-1 model: ChiMei InnoLux 0x150c built: 2018 res: 1920x1080
    hz: 60 dpi: 142 gamma: 1.2 size: 344x193mm (13.54x7.6") diag: 394mm (15.5")
    ratio: 16:9 modes: 1920x1080
  OpenGL: renderer: Mesa Intel UHD Graphics 630 (CFL GT2) v: 4.6 Mesa 22.1.7
    direct render: Yes
mhwd -li
> Installed PCI configs:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
     video-modesetting            2020.01.13                true            PCI
video-hybrid-intel-nvidia-prime            2021.11.04               false            PCI


Warning: No installed USB configs!
mhwd -l
> 0000:01:00.0 (0300:10de:1f36) Display controller nVidia Corporation:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
video-hybrid-intel-nvidia-prime            2021.11.04               false            PCI
video-hybrid-intel-nvidia-470xx-prime            2021.11.04               false            PCI
          video-nvidia            2021.11.04               false            PCI
    video-nvidia-470xx            2021.11.04               false            PCI
           video-linux            2018.05.04                true            PCI
     video-modesetting            2020.01.13                true            PCI
            video-vesa            2017.03.12                true            PCI


> 0000:00:02.0 (0300:8086:3e9b) Display controller Intel Corporation:
--------------------------------------------------------------------------------
                  NAME               VERSION          FREEDRIVER           TYPE
--------------------------------------------------------------------------------
video-hybrid-intel-nvidia-prime            2021.11.04               false            PCI
video-hybrid-intel-nvidia-470xx-prime            2021.11.04               false            PCI
           video-linux            2018.05.04                true            PCI
     video-modesetting            2020.01.13                true            PCI
            video-vesa            2017.03.12                true            PCI

mhwd-kernel -li
Currently running: 5.15.65-1-MANJARO (linux515)
The following kernels are installed in your system:
   * linux515
   * linux519
pamac list --installed | grep "nvidia" | grep -v "mhwd"  
lib32-nvidia-utils                 515.65.01-1                   multilib   125,7 MB
linux515-nvidia                    515.65.01-8                   extra      40,2 MB
linux519-nvidia                    515.65.01-13                  extra      40,4 MB
nvidia-prime                       1.0-4                         extra      112 Bytes
nvidia-utils                       515.65.01-3                   extra      469,5 MB
opencl-nvidia                      515.65.01-3                   extra      72,5 MB

Ok, I reinstalled Manjaro. Both screens work now.

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