Hdmi with thinkpad T520[solved]

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

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