I've found a workaround that works reliably. Add to the kernel command- line:
acpi_osi=! acpi_osi="Windows 2013" Edit "/etc/default/grub" to include those options in GRUB_CMDLINE_LINUX (there can be other options there too): GRUB_CMDLINE_LINUX="debug acpi_osi=! acpi_osi=\"Windows 2013\"" Regenerate the GRUB config: $ sudo update-grub After a reboot the touchscreen should work and 'dmsg' (/var/log/kern.log) should include: ACPI: Disabled all _OSI OS vendors ... ACPI: Added _OSI(Windows 2013) ... usb 1-7: new full-speed USB device number 5 using xhci_hcd usb 1-7: New USB device found, idVendor=06cb, idProduct=11ef usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 1-7: Product: Synaptics Touch Digitizer V04 usb 1-7: Manufacturer: SYNAPTICS ... input: SYNAPTICS Synaptics Touch Digitizer V04 as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/0003:06CB:11EF.0003/input/input11 input: SYNAPTICS Synaptics Touch Digitizer V04 Pen as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/0003:06CB:11EF.0003/input/input12 hid-multitouch 0003:06CB:11EF.0003: input,hiddev0,hidraw2: USB HID v1.11 Mouse [SYNAPTICS Synaptics Touch Digitizer V04] on usb-0000:00:14.0-7/input0 ** Patch added: "dmesg diff of failed vs working with AC connected" https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1574028/+attachment/4644848/+files/ac-connected-failed-vs-working.diff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574028 Title: 16,04: Asus T300 CHI: touchscreen digitiser missing at boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1574028/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
