Quake

Run GLX quake2 with the +set _windowed_mouse 1 option. GLX Quake2 is running in a window,
even though it appears to take up your whole screen. If you move the mouse while the WM is in
Linux Quake HOWTO
When I try to run Quake II with the GL renderer, it fails and says "LoadLibrary("ref_gl.so") failed: Unable to resolve 39
focus−follows−mouse mode, you're likely to move the pointer outside this window, and then Quake II will
stop responding to mouse and keyboard input. +set _windowed_mouse 1 makes Quake II grab the
mouse exclusively.
Why can't I change to some of the SVGA modes that are in the Quake II
Video menu?
SVGAlib probably doesn't know how to create the modes on your card. When Quake II starts up with the
SVGA renderer (ref_soft.so), it prints a list of all the modes that SVGAlib tells it are available:
−−−−−−− Loading ref_soft.so −−−−−−−
Using RIVA 128 driver, 4096KB.
mode 320: 200 1075253220
mode 320: 240 1075253220
mode 320: 400 1075253220
mode 360: 480 1075253220
mode 640: 480 1075253220
mode 800: 600 1075253220
mode 1024: 768 1075253220
mode 1280: 1024 1075253220
These are the only modes you will be able to successfully switch to from the Video menu. If say, 512x384
isn't on the list, selecting it from the Video menu won't work.
SVGAlib does let you define new video modes for some chipsets in libvga.config, so you may be able
create your own video mode this way. See the SVGAlib documentation for more detail on this topic.