From: Eric Miao <eric.m...@canonical.com>

In summary, the symptom is intermittent key events lost after resume
on some machines with synaptics touchpad (seems this is synaptics _only_),
and key events loss is due to serio port reconnect after psmouse sync lost.
Removing psmouse and inserting it back during the suspend/resume process
is able to work around the issue, so the difference between
psmouse_connect()
and psmouse_reconnect() is the key to the root cause of this problem.

After comparing the two different paths, synaptics driver has its own
implementation of synaptics_reconnect(), and the missing psmouse_probe()
seems significant, the patch below added psmouse_probe() to the reconnect
process, and has been verified many times that the issue could not be
reliably
reproduced.

There are two PS/2 commands in psmouse_probe():

  1. PSMOUSE_CMD_GETID
  2. PSMOUSE_CMD_RESET_DIS

Only the PSMOUSE_CMD_GETID seems to be significant. The
PSMOUSE_CMD_RESET_DIS is irrelevant to this issue after trying
several times.  So we have only implemented this patch to issue
the PSMOUSE_CMD_GETID so far.

Tested-by: Daniel Manrique <daniel.manri...@canonical.com>
Signed-off-by: James M Leddy <james.le...@canonical.com>
---
 drivers/input/mouse/synaptics.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/input/mouse/synaptics.c
b/drivers/input/mouse/synaptics.c
index 12d12ca..3438a9d 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -1355,6 +1355,7 @@ static int synaptics_reconnect(struct psmouse
*psmouse)
 {
        struct synaptics_data *priv = psmouse->private;
        struct synaptics_data old_priv = *priv;
+       unsigned char param[2];
        int retry = 0;
        int error;
 @@ -1370,6 +1371,7 @@ static int synaptics_reconnect(struct psmouse
*psmouse)
                         */
                        ssleep(1);
                }
+               ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
                error = synaptics_detect(psmouse, 0);
        } while (error && ++retry < 3);
 -- 1.7.9.5





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