dmitry wrote: > Hi Paul, > > On Tuesday 02 June 2009 12:47:59 pgf@xxxxxxxxxx wrote: > > The OLPC XO laptop incorporates a combination touchpad/tablet > > device which unfortunately requires frequent recalibration. The > > driver will force this automatically when various suspicious > > behaviors are observed, and the user can recalibrate manually > > (with a special keyboard sequence). There's currently no way, > > however, for an external program to cause recalibration. > > > > This patch creates a new node in /sys which, when written with '1', > > will force a touchpad recalibration. No other writes (or reads) > > of this node are supported. > > > > > Instead of creating a new sysfs attribute maybe we should make > the touchpad recalibrate upon resume (reconnect)? Userspace can > already request reconnect via sysfs. dmitry -- thanks for the suggestion. i took a look, and tried it. the problem is that doing a full reset of the touchpad takes quite a long time -- 1.1 or 1.2 seconds. recalibration deprives the user of their touchpad for long enough as it is -- i don't think we can afford that time. (remember that this is a workaround for bad hardware -- the XO no longer uses this touchpad at least partly due to this very issue, but there are enough in use that we're still trying to improve things.) paul =--------------------- paul fox, pgf@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
