Lo! On 14.03.2017 06:10, Cameron Gutman wrote: > On 03/13/2017 06:35 PM, Andrew Duggan wrote: >> On 03/13/2017 06:15 AM, Benjamin Tissoires wrote: >>> On Mar 13 2017 or thereabouts, Benjamin Tissoires wrote: >>>> On Mar 13 2017 or thereabouts, Thorsten Leemhuis wrote: >>>>> Lo! On 12.03.2017 02:55, Cameron Gutman wrote: >>>>>> […] >>>>>> Compared to hid-multitouch, the RMI stack seems to have completely broken >>>>>> palm rejection and introduced some random jumpiness during fine pointing >>>>>> motions. […] >>>>> Just to confirm: I noticed "jumpiness during fine pointing motions" as >>>>> well since switching to 4.11-rc. >>> One of my test systems is a XPS 13 9343 and I have not really >>> seen any jumpiness. But, based on the data I am seeing that if I >>> lift my finger and place it again in a short period of time the >>> first event or so will be at the location of the previous >>> contact. Then it will switch over to the current location. When >>> switching over to hid-multitouch I was unable to reproduce this >>> behavior. This definitely could be the source of the jumps. > The jumpiness definitely happens without lifting my finger, but I'm willing > to test any patch you think would improve the situation. Moving one finger > slowly in a figure-8 across my touchpad shows the issue clearly for me. The > small variations in speed of my finger due to the friction on the trackpad > get magnified to relatively large jumpy pointer movements on screen. It > seems much more noticeable in diagonal movements than completely vertical > or horizontal movements. @Andrew: Is there anything we can do to help track this down? A evemu-record of some movements or something like that? Or do we need to bring Peter into the loop in case it has something to do with libinput? Ciao, Thorsten -- 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
