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From: Dave MacFarlane <driusan@gmail.com>
Date: Sun, 3 Jul 2016 19:59:23 -0400
Message-ID: <CAG2UyHq+hKX-FAMPTaNf=Mhcska6vr5qtSE4=_4iaAjYaT_EQQ@mail.gmail.com>
Subject: reset ps2 mouse on boot
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In the end, this was the minimal set of changes I needed to get my
trackpad back into PS/2 mode when doing a soft reboot from another OS
with a synaptics driver that leaves it in absolute mode. I just force
a PS/2 reset in the ps2mouse() initialization.

*** mouse.c   2016-07-03 19:37:16.212173929 -0400
--- mouse.mine.c        2016-07-03 19:44:26.317392202 -0400
***************
*** 168,173 ****
--- 168,175 ----
        mousehwaccel = 0;

        i8042auxenable(ps2mouseputc);
+       i8042auxcmd(0xFF); /* force a reset */
+       delay(500);
        i8042auxcmd(0xEA);      /* set stream mode */
  }


-- 
- Dave