[3.13.y-ckt stable] Patch "Input: synaptics - fix handling of disabling gesture mode" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    Input: synaptics - fix handling of disabling gesture mode

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11-ckt28.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 94bbe488f7a38915e8b2b21676678a5a1778adbc Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov at gmail.com>
Date: Thu, 20 Aug 2015 14:28:48 -0700
Subject: Input: synaptics - fix handling of disabling gesture mode

commit e51e38494a8ecc18650efb0c840600637891de2c upstream.

Bit 2 of the mode byte has dual meaning: it can disable reporting of
gestures when touchpad works in Relative mode or normal Absolute mode,
or it can enable so called Extended W-Mode when touchpad uses enhanced
Absolute mode (W-mode). The extended W-Mode confuses our driver and
causes missing button presses on some Thinkpads (x250, T450s), so let's
make sure we do not enable it.

Also, according to the spec W mode "... bit is defined only in Absolute
mode on pads whose capExtended capability bit is set. In Relative mode and
in TouchPads without this capability, the bit is reserved and should be
left at 0.", so let's make sure we respect this requirement as well.

Reported-by: Nick Bowler <nbowler at draconx.ca>
Suggested-by: Gabor Balla <gaborwho at gmail.com>
Tested-by: Gabor Balla <gaborwho at gmail.com>
Tested-by: Nick Bowler <nbowler at draconx.ca>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/input/mouse/synaptics.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 17b0285..e772a2a 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -486,14 +486,18 @@ static int synaptics_set_mode(struct psmouse *psmouse)
 	struct synaptics_data *priv = psmouse->private;

 	priv->mode = 0;
-	if (priv->absolute_mode)
+
+	if (priv->absolute_mode) {
 		priv->mode |= SYN_BIT_ABSOLUTE_MODE;
-	if (priv->disable_gesture)
+		if (SYN_CAP_EXTENDED(priv->capabilities))
+			priv->mode |= SYN_BIT_W_MODE;
+	}
+
+	if (!SYN_MODE_WMODE(priv->mode) && priv->disable_gesture)
 		priv->mode |= SYN_BIT_DISABLE_GESTURE;
+
 	if (psmouse->rate >= 80)
 		priv->mode |= SYN_BIT_HIGH_RATE;
-	if (SYN_CAP_EXTENDED(priv->capabilities))
-		priv->mode |= SYN_BIT_W_MODE;

 	if (synaptics_mode_cmd(psmouse, priv->mode))
 		return -1;
--
1.9.1