eduardo h. silva wrote: > 2012/5/17 Paul Fox <p...@laptop.org>: > > eduardo h. silva wrote: > > > xset q tells that in 11.3.1, the pointer is configured with the values: > > > > > > acceleration 7/4 threshold: 1 > > > > > > This takes 2, 3 and sometimes 4 swipes to move across the screen. It's > > > quite a difference with a typical touchpad on bigger laptops, and > > > although the experience can't be duplicated because we can't expect > > > kids to be already highly trained with a touchpad, I think it could be > > > improved. > > > > > > I think the balance is to have a larger threshold, so that slow > > > movements are allways acurate, and a higher acceleration, so that > > > movements across the screen are sufficiently fast (very important in > > > Sugar to access the frame for example). Managing to drop down the > > > amount of swipes needed to move across the screen (like 2 swipes) > > > would be excellent and more in par with the older pre 11.3.* behavior. > > > > so you think it was better, previously? > > > > i wonder what has changed. those xset values were chosen specifically > > to be appropriate for the original ALPS touchpad on XO-1. it's > > entirely possible, now that we're two laptops and at least as many > > touchpads beyond that, those numbers are incorrect. > > I meant to compare between the setting of the builds back in 2008 and > 2011 when I began using the XO after a hiatus of years. > > I found a discussion started about the change from "acceleration 7/4 > threshold: 1" to "acceleration 7/4 threshold: 0) > (http://lists.laptop.org/pipermail/devel/2010-January/027245.html ). A > few messages later, it's shown in xset man page: > > "If the `threshold' parameter is provided and 0, the > `acceleration' parameter will be used in the exponent of a > more natural and continous formula, giving precise control > for slow motion but big reach for fast motion, and a > progresive transition for motions in between. Recommended > `acceleration' value in this case is 3/2 to 2, but not > limited to that range " > > Which is exactly what I was looking for. A bit later, Richard A. Smith tells: > > "2 of the apps that our deployments spend a lot of time in are scratch > and etoys. Both of these are not completely sugarized apps and thus > some of the UI elements on the 200 dpi screen are quite small and hard > to use with a fast accel." Though I don't know if he used higher > acceleration values, or with threshold set to 0. > > So the thread ends with: > > "Find someone with kids and figure out whats the best settings for them." > > Next time I am with my nephews I'll be sure to do this, but I already > find threshold 0 a lot better. Perhaps the problem Richard was having > could be solved with a lower acceleration, like 3/2, but still with > threshold 0.
i'm sure you're right, and i think we had consensus around that several years ago. it's my belief (after skimming old mail) that the very earliest X servers shipped on XO-1 a) did treat a threshold of 0 as special, but b) did not do it correctly. so using '1' at that time was deliberate. but after a time we (i, certainly) agreed that we should be using 0. we also had a discussion about lowering the 7/4 -- at the time i thought 3/2 was too slow, and suggested 165/100, but i suspect that that's splitting hairs. (i.e. 1.5 vs. 1.65). after verifying, we should at least fix the '0' threshold as a bug, in 12.1.0. paul =--------------------- paul fox, p...@laptop.org _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel