No idea.
Use Windows/Linux to determine which graphics system supports the HDMI connector.
I've tried in Linux since Windows Device Manager -> Expanded both Display Adapters and Connected TV does not show which GPU HDMI uses.
Entered the line below in Linux terminal and pressed enter without HDMI cable, waited a few seconds and with HDMI cable connected.
clear && sudo lshw -numeric -C display && echo -e "\ n" && read -n 1 -s -r - p "HDMI disconnected" && echo -e "\ n" && xrandr --listproviders --listmonitors && echo -e "\ n" && read -n 1 -s -r -p "HDMI Connected" && echo -e "\ n "&& xrandr --listproviders --listmonitors
Which gave me the following output:
*-display
description: VGA compatible controller
product: NVIDIA Corporation [10DE:1C20]
vendor: NVIDIA Corporation [10DE]
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master
cap_list rom
configuration: driver=nvidia latency=0
resources: irq:147 memory:de000000-deffffff
memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:e000(size=128)
memory:df000000-df07ffff
*-display
description: VGA compatible controller
product: Intel Corporation [8086:591B]
vendor: Intel Corporation [8086]
physical id: 2
bus info: pci@0000:00:02.0
version: 04
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master
cap_list rom
configuration: driver=i915 latency=0
resources: irq:132 memory:dd000000-ddffffff
memory:b0000000-bfffffff ioport:f000(size=64) memory:c0000-dffff
HDMI disconnected
Providers: number : 3
Provider 0: id: 0x246 cap: 0x1, Source Output crtcs: 4 outputs: 3
associated providers: 1 name:NVIDIA-0
Provider 1: id: 0x43 cap: 0x2, Sink Output crtcs: 3 outputs: 1
associated providers: 1 name:modesetting
Provider 2: id: 0x43 cap: 0x2, Sink Output crtcs: 3 outputs: 1
associated providers: 1 name:modesetting
Monitors: 1
0: +*eDP-1-1 1920/381x1080/214+0+0 eDP-1-1
HDMI connected
Providers: number : 3
Provider 0: id: 0x246 cap: 0x1, Source Output crtcs: 4 outputs: 3
associated providers: 1 name:NVIDIA-0
Provider 1: id: 0x43 cap: 0x2, Sink Output crtcs: 3 outputs: 1
associated providers: 1 name:modesetting
Provider 2: id: 0x43 cap: 0x2, Sink Output crtcs: 3 outputs: 1
associated providers: 1 name:modesetting
Monitors: 2
0: +*eDP-1-1 1920/381x1080/214+0+0 eDP-1-1
1: +HDMI-0 1920/1060x1080/626+1920+0 HDMI-0
Then it is confirmed that it is NVIDIA that gives signal, is there any hope now ?