[3.19.y-ckt stable] Patch "Input: alps - do not reduce trackpoint speed by half" 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: alps - do not reduce trackpoint speed by half

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt3.

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

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 243c0259e055f18d3279a3e2a3d8a04dbfb5a655 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede at redhat.com>
Date: Thu, 4 Jun 2015 22:31:43 -0700
Subject: Input: alps - do not reduce trackpoint speed by half

commit 088df2ccef75754cc16a6ba31829d23bcb2b68ed upstream.

On some v7 devices (e.g. Lenovo-E550) the deltas reported are typically
only in the 0-1 range dividing this by 2 results in a range of 0-0.

And even for v7 devices where this does not lead to making the trackstick
entirely unusable, it makes it twice as slow as before we added v7 support
and were using the ps/2 mouse emulation of the dual point setup.

If some kind of generic slowdown is actually necessary for some devices,
then that belongs in userspace, not in the kernel.

Reported-and-tested-by: Rico Moorman <rico.moorman at gmail.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires at gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/input/mouse/alps.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index d88d73d..7dc514f 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -1046,9 +1046,8 @@ static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
 	right = (packet[1] & 0x02) >> 1;
 	middle = (packet[1] & 0x04) >> 2;

-	/* Divide 2 since trackpoint's speed is too fast */
-	input_report_rel(dev2, REL_X, (char)x / 2);
-	input_report_rel(dev2, REL_Y, -((char)y / 2));
+	input_report_rel(dev2, REL_X, (char)x);
+	input_report_rel(dev2, REL_Y, -((char)y));

 	input_report_key(dev2, BTN_LEFT, left);
 	input_report_key(dev2, BTN_RIGHT, right);
--
1.9.1