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While writing an X video driver, I was recently looking at xf86str.h, a standard Xorg header file, for the PROBE_ types, and noticed there was a third I had never heard of, namely PROBE_TRYHARD. Under what circumstances, if any, would an X server put that flag in a call to a driver’s Probe function, and what would the Probe function be expected to do in response?
It seems to be totally unused, both in the X server and in all xf86-video DDXs (drivers).
According to an X developer, it “was probably meant for the bad old days when you had to smash ISA ports and guess”