It seems that the touchscreen digitiser is disabled if AC power is connected during boot-up. Leaving the AC plug disconnected and the touch is reliably available.
This definitely looks like an ACPI DSDT issue. -- 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 : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
