On Tue, Jan 30, 2018 at 04:18:26PM +1000, Peter Hutterer wrote: > On Wed, Jan 24, 2018 at 10:47:10AM +0100, Johannes Pointner wrote: > > On Wed, Jan 24, 2018 at 10:18 AM, Peter Hutterer > > <peter.hutte...@who-t.net> wrote: > > > On Wed, Jan 24, 2018 at 10:04:52AM +0100, Johannes Pointner wrote: > > >> Hello, > > >> > > >> I have noticed that since we are using xf86-input-libinput all our > > >> touchscreens (resistive and pcap) reporting a value of 15 for > > >> maxTouchPoints. > > >> After further looking into this I saw that xf86-input-libinput sets > > >> this value fix to 15. I also checked if it is possible to get this > > >> info from libinput but I wasn't able to find a possibility. > > >> > > >> Is this intentionally? > > > > > > mostly, it's largely a matter of not exporting information that doesn't > > > need > > > to be exported. at least with touchpads libinput does a few tricks and > > > changes the number of touches available (not yet at runtime, but who > > > knows) > > > - once we start exporting this we're a lot more limited in what we can do > > > internally to work around broken devices. > > > > > > Main question is though: what do you need this value for? > > We use this value which is available through the browser > > (https://developer.mozilla.org/en-US/docs/Web/API/Navigator/maxTouchPoints) > > to determine if it is a multitouch device or not. > > The same goes for Qt > > (http://doc.qt.io/qt-5/qtouchdevice.html#maximumTouchPoints) which has > > a libinput backend. > > Actually, this is something we could fix in the driver by checking for > ABS_MT_SLOT and forcing it to 1 when missing. that wouldn't fix Qt though, > so it may be better to have this exported by libinput after all... > Need to think of the various special cases here.
for reference, I filed this bug: https://bugs.freedesktop.org/show_bug.cgi?id=104867 Cheers, Peter _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/wayland-devel
