I am trying to run an old X11 application that requires PseudoColor visuals on a newer Linux workstation. The workstation does not advertise any PseudoColor visuals through xdpyinfo. Only TrueColor and DirectColor are available. Is there a way to enable 8-bit PseudoColor visuals? I tried setting the default depth to 8 in xorg.conf, but that prevented Xorg from starting, and is not the mode we want to run in by default.
Workstation is x86_64 running RHEL 7.9 and has a Nvidia Quadro P2200 card. Nvidia driver version is 440.82.