Yes, nothing on 3.18 Originally I didn't test any of the stable releases for 3.18, it was the standard 3.18, I believe the hash assigned to the tag 'v3.18'. http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-vivid/
It would make sense to me if it was broken somewhere in between v3.18 and v3.18.3 though as lots of stuff that goes into mainline backports to @stable. I went back and tried the stable releases on the mainline PPA. v3.18.1: OK v3.18.2: OK v3.18.3: Reproduces problem Between 3.18 and 3.19-rc1 there's 4 commits to i2c-hid (most likely culprit driver to me) d1c7e29e8d276c669e8790bb8be9f505ddc48888 HID: i2c-hid: prevent buffer overflow in early IRQ 721564a950fdbc07adf9c1e114b73feb97446ec2 i2c-hid / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM 6296f4a8eb86f9abcc370fb7a1a116b8441c17fd HID: i2c-hid: fix race condition reading reports 08bb7beae7fe102939fe5931222fc09e10d27cda HID: i2c-hid: print the correct data in dbg msg Between 3.18.2 and 3.18.3 these other two stand out to me - same as they were between 3.18 and 3.19-rc1 HID: i2c-hid: prevent buffer overflow in early IRQ HID: i2c-hid: fix race condition reading reports -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1416601 Title: touchpad does not respond to tap-to-clicks in I2C mode in Ubuntu 15.04 on 2015 XPS 13 (9343) To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1416601/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
