On 2/26/15, Ulf Brosziewski <ulf.brosziew...@t-online.de> wrote: > On 02/26/2015 02:32 AM, patrick keshishian wrote: >> On 2/25/15, Ulf Brosziewski<ulf.brosziew...@t-online.de> wrote: >>> On 02/25/2015 11:53 PM, patrick keshishian wrote: >>>> Hi, >>>> >>>> On 2/25/15, joshua stein<j...@openbsd.org> wrote: >>>>> On Tue, 24 Feb 2015 at 12:32:10 -0800, patrick keshishian wrote: >>>>>> I'm noticing slight annoyance with recent update from 20141121 >>>>>> snapshot to 20150217. >>>>>> >>>>>> My touchpad, while two-finger scrolling (up/down) sometimes ignores >>>>>> the scrolls. I have to lift my fingers and retry the gesture to >>>>>> initiate >>>>>> the scroll. >>>>> >>>>> There was a change to pms(4) (r1.57) but it should only affect >>>>> elantech touchpads, so it's probably the r1.11 change to the >>>>> synaptics xorg driver which affects all of them: >>>>> >>>>> http://cvsweb.openbsd.org/cgi-bin/cvsweb/xenocara/driver/xf86-input-synaptics/src/wsconscomm.c >>>>> >>>>> Can you try recompiling that driver with that last revision backed >>>>> out and see if it fixes the problem? >>>> >>>> Thanks for the reply and hint. >>>> Took me a while longer as I made the mistake of rebuilding >>>> the entire xenocara. >>>> >>>> Indeed this revision seems to be the cause of the issue; at >>>> least I've not been able to run into the issue in the last 10 >>>> minutes or so, whilst trying my best. >>>> >>>> Thanks to Henrik Friedrichsen for also confirming the issue >>>> and the fix. >>>> >>>> Cheers, >>>> --patrick >>>> >>>> >>> >>> Unfortunately that "fix" might reintroduce other problems, at least >>> with other touchpads, and maybe even with yours. For example, if you >>> start a scrolling operation by making two touches at the same time, >>> I would expect that it begins with a "jump". Would you mind check that? >>> I can't make any tests myself, there is no synaptics touchpad around >>> here. >> >> Hi, >> >> I'm not sure what you mean exactly by "making two touches >> at the same time". >> >> The way I initiate a scroll is by placing two fingers (typically my >> index and middle fingers) on the touchpad and moving them >> up/down or left/right. >> >> It has never begun with any "jump". >> >> The change which prompted this thread, was absolutely annoying. >> e.g., While reading a PDF document. I'd have to remove my fingers >> and touch the touchpad again, very frequently, in order to continue >> scrolling. Where as before (and now with the revision rollback) I can >> completely concentrate on reading the document. >> >> Best, >> --patrick >> >> > > Hi Patrick, > > thanks for the reply. What I meant was this: There can be a (possibly > small) time interval between the contacts, or this interval can be > (nearly) zero. In the first case, the "finger count" of the driver > should change from 0 to 1, then from 1 to 2. If the hardware is not > extremely accurate it may change directly from 0 to 2 in the second > case. If the hardware *is* very accurate, it may be difficult to produce > these "double contacts". The test I had in mind could look like this: You > move the cursor over a scrollable document, lift the moving finger, then > make a "double contact" on a position that has a noticeable (vertical) > distance from the previous contact point. If the document moves/"jumps" > when the double contact is made, there's something wrong. This can > happen when the driver doesn't "count" properly.
Hello and thanks for the clarification of your test-case. I have been attempting it this morning, but not able to see any jumps. It seems/feels pretty "solid". Sorry, --patrick > Regards, > Ulf
