The attachment "dmesg diff of failed vs working with AC connected" seems
to be a patch. If it isn't, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are a member of the
~ubuntu-reviewers, unsubscribe the team.
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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\""
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.
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Bugs, which
** Attachment added: "ACPI DSDT decompiled"
https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1574028/+attachment/4644326/+files/dsdt.dsl
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https://bugs.launchpad.net/bugs/1574028
** Summary changed:
- 16,04: Asus T300 CHI: touchscreen missing at boot
+ 16,04: Asus T300 CHI: touchscreen digitiser missing at boot
** Attachment added: "lsusb after cold boot"
