Re: Synaptics RMI4 touchpad regression in 4.11-rc1

[Andrew Duggan]

On 03/14/2017 01:14 AM, Thorsten Leemhuis wrote:
> 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:
> > > > > > > [â]
> > > > > > > Compared to hid-multitouch, the RMI stack seems to have completely broken
> > > > > > > palm rejection and introduced some random jumpiness during fine pointing
> > > > > > > motions. [â]
> > > > > > 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?

Yes, collecting some evemu-record logs of the jumps would be useful. 
Only after installing Fedora 25 was I able to see jumps while moving 
diagonally. I'm interested in seeing what others record and if it is the 
same as what I saw. The log of the jump did show the jump on Fedora 25. 
But, I did not see the jump with Ubuntu 16.10 with libinput 1.4.3.

Andrew

> Ciao, Thorsten