I found a workaround from
https://answers.launchpad.net/ubuntu/+question/243145 that works with
the X201 tablet, and it does not require rebooting, logging off and on
again, or switching between virtual consoles.  Try entering

sudo inputattach --daemon -w8001 /dev/ttyS4

If that does not work for you, then it is likely that the Wacom device
is represented by a different device path (i.e. not /dev/ttyS4).  Try
executing

sudo cat /proc/tty/driver/serial | grep 16550A

which should output lines that look like the following:

4: uart:NS16550A port:00000200 irq:5 tx:19 rx:411732 RTS|DTR

The grep command filters out the /proc/tty/driver/serial output so that
only 16550A entries are shown (since the Wacom device is a 16550A serial
device).  The number 4 at the beginning of the line before the colon
indicates that this line corresponds to TTY device #4, which is
represented by /dev/ttyS4.  So, for example, if the number was 1 instead
of 4, you would enter /dev/ttyS1 in the inputattach command instead of
/dev/ttyS4.  If you see multiple lines in the filtered
/proc/tty/driver/serial output, I would suggest going down the list
until you find the correct device that reactivates the touchscreen.

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https://bugs.launchpad.net/bugs/1275416

Title:
  touchscreen do not work after suspend/resume

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