My Linux desktop has two displays (DELL and Samsung), Nvidia GP107 (GeForce GTX 1050 Ti) with HDMI and DVI outputs. The operating system is Linux Debian Bullseye (version 11.9).

Today I upgraded the Nvidia proprietary drivers from version 550.54.15-1 to version 555.42.02-1 (several .deb packages) and as a result, only the HDMI-connected display works now in X-Window.

When the computer boots, the text display is via the DVI screen, and when X-Window works, the DVI screen displays nothing and information is displayed on the HDMI-connected screen.

The output of 'xrandr | grep connect' is as follows: DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 476mm x 267mm HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm

I saw no obvious error messages in /var/log/Xorg.0.log nvidia-smi does not display anything abnormal. glxgears works on the screen connected via HDMI.

I tried few versions of /etc/X11/xorg.conf (/etc/X11/xorg.conf.d/ is empty) including having no xorg.conf at all. All of them yield the same results (only the HDMI-connected screen displays stuff).

Questions: 1. Does anyone know if Nvidia disabled, in version 555.42.*, their DVI support or changed its configuration options? 2. What, if any, configuration options should I check?

Thanks, --- Omer Zak