According to strings, /usr/bin/glxgears contains: -display -info -stereo -fullscreen -iacknowledgethatthistoolisnotabenchmark -printfps Also, the current git source of mesa only has these options in glxgears.c: -display -info -stereo -fullscreen The current version included in mesa-utils 6.3.2-1 (the one strings was run against) does not include a usage message, but later versions (e.g. the one from git) do.