I’m going to become crazy.
I changed, as suggested, to kernel 5.6.19
installed again
`sudo apt install -t buster-backports bumblebee-nvidia nvidia-driver bumblebee primus`
rebooted
and then I get the following
lspci -k | grep -A 2 -E "(VGA|3D)"
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics Controller
Kernel driver in use: i915
--
01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [Quadro NVS 4200M] (rev ff)
Kernel modules: nvidia
01:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev ff)
and
nvidia-settings
ERROR: NVIDIA driver is not loaded
ERROR: Unable to load info from any available system
And now?
Just for fun (?) I tried the live version of OS Neptune 6.5. And there, without any changes from me, the nouveau driver (at least) has been working.
And, as far as I know, the nouveau driver is supporting hdmi. Should I change the OS?
Ciao!
Dieter