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Removing 'nomodset' from GRUB_CMDLINE_LINUX_DEFAULT parameter in /etc/default/grub helped.
The line which was left:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
then

sudo update-grub
and the...

External display is not detected through HDMI
Computer: Lenovo E590
Ubuntu Impish Indri 21.10
Kernel: 5.11.0-18-generic

Graphic card:


lspci | grep -i --color 'vga\|3d\|2d'
00:02.0 VGA...