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 Desktop Packages, which is subscribed to xinput in Ubuntu. https://bugs.launchpad.net/bugs/1574028 Title: 16,04: Asus T300 CHI: touchscreen digitiser missing at boot Status in xinput package in Ubuntu: New Bug description: Using 16.04 amd64 on an Asus T300 CHI 2-in-1 transformer-book (tablet + docking Bluetooth keyboard/trackpad). At boot-time the USB-connected Synaptics touchscreen digitiser is not recognised but after an S3 sleep/resume it is. Smells like an ACPI issue but so far testing with and without acpi_osi="Windows 2013" (one of 2 OSI strings the ACPI DSDT recognises, and the most featureful of the two) has not solved it. What is strange is the installer's 'Try Ubuntu' live session did have an active touchscreen. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1574028/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
