From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Schmidt <yath@yath.de>
Subject: Re: PROBLEM: Changing speed on ThinkPad X1 Carbon 5th trackpoint
 causes "failed to enable mouse"
Date: Sat, 30 Dec 2017 16:53:58 +0100
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To: Aaron Ma <aaron.ma@canonical.com>
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On Sat, Dec 30, 2017 at 11:46:53PM +0800, Aaron Ma wrote:
> Without my commit the trackpoint is identified to "generic PS/2 mouse",
> some features like the scroll mode (middle button and trackpoint) can
> not work.

Actually, this used to work even prior to your patch for me. So we
apparently have different types of Trackpoint.