On GNU/Linux i use custom display resolutions a lot, added from xorg.conf modelines.
How can we add these resolution on HaikuOS as well? Is that a simple text file to edit (like /etc/X11/xorg.conf on GNU/Linux), or do we need a special tweak tool for that?
The “screenmode” command line app can be used with modelines. Note that if you use the VESA driver, only the modes exposed by your BIOS can be used.