On Thu, 2018-05-31 at 13:44 -0700, Laura Abbott wrote: > On 05/24/2018 04:13 PM, Timur Kristóf wrote: > > Hi, > > > > On the XPS 13 9360 and 9370 xinput sees two touchpads instead of > > one: > > ⎡ Virtual core pointer id=2 [master > > pointer (3)] > > ⎜ ↳ Virtual core XTEST > > pointer id=4 [slave pointer (2)] > > ⎜ ↳ DELL07E6:00 06CB:76AF > > Touchpad id=12 [slave pointer (2)] > > ⎜ ↳ SynPS/2 Synaptics > > TouchPad id=17 [slave pointer (2)] > > > > dmesg also gives me the following: > > > > [ 1.429811] psmouse serio1: synaptics: Your touchpad (PNP: > > DLL07e6 > > PNP0f13) says it can support a different bus. If i2c-hid and hid- > > rmi > > are not used, you might want to try setting > > psmouse.synaptics_intertouch to 1 and report this to > > linux-input@xxxxxxxxxxxxxxx. > > > > The Dell one is the real touchpad, the other one is an artifact of > > the > > psmouse driver. Weird touchpad freezes and jittering issues can be > > observed when both of these devices are there. The general advice > > on > > the web is to blacklist the psmouse driver. (This is also published > > by > > Dell as a .deb package which contains a config file doing just > > this.) > > > > However, on Fedora I cannot blacklist the psmouse driver because it > > is > > compiled built-in instead of as a module. Could you guys change the > > Fedora kernel config to compile it as a module instead? > > > > Thanks & best regards, > > Timur > > So assuming nobody else has objections, I think it's okay to at > least try this on rawhide and see if it uncovers any other problems. > > Thanks, > Laura > Looking into this a bit more, the root cause of this issue is that the touchpad is wired up in such a way that it is accessible on both PS/2 and I2C. I2C is preferred and used by i2c-hid but at the same time the PS/2 interface is also picked up by psmouse. Thus, Xorg sees the two interfaces as two different devices. Solution would be to somehow remove the psmouse-detected device node from the system when i2c-hid detects the same device. Is this possible? Best regards, Timur _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx/message/ERFGUJYBFPHJ7Q6N6XASJVE5SCDVPVBG/
