On Monday, September 10, 2012 07:47:07 AM Seth Forshee wrote: > Commit c039450 (Input: synaptics - handle out of bounds values from the > hardware) caused any hardware reported values over 7167 to be treated as > a wrapped-around negative value. It turns out that some firmware uses > the value 8176 to indicate a finger near the edge of the touchpad whose > actual position cannot be determined. This value now gets treated as > negative, which can cause pointer jumps and broken edge scrolling on > these machines. > > I only know of one touchpad which reports negative values, and this > hardware never reports any value lower than -8 (i.e. 8184). Moving the > threshold for treating a value as negative up to 8176 should work fine > then for any hardware we currently know about, and since we're dealing > with unspecified behavior it's probably the best we can do. The special > 8176 value is also likely to result in sudden jumps in position, so > let's also clamp this to the maximum speicified value for the axis. It looks like there is another touchpad that got broken with that "out of bounds" change, see: https://bugzilla.kernel.org/show_bug.cgi?id=46371 Thanks. -- Dmitry -- 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
