Disable kernel tracking on SMBus devices (rhbz 1482648)

2 files changed, 57 insertions, 0 deletions

diff --git a/Input-synaptics---Disable-kernel-tracking-on-SMBus-devices.patch b/Input-synaptics---Disable-kernel-tracking-on-SMBus-devices.patch
new file mode 100644
index 000000000..81e858fd0
--- /dev/null
+++ b/Input-synaptics---Disable-kernel-tracking-on-SMBus-devices.patch
@@ -0,0 +1,51 @@
+From patchwork Thu Sep 28 20:07:19 2017
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 8bit
+Subject: Input: synaptics - Disable kernel tracking on SMBus devices
+From: Andrew Duggan <aduggan@synaptics.com>
+X-Patchwork-Id: 9976729
+Message-Id: <1506629239-5940-1-git-send-email-aduggan@synaptics.com>
+To: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
+Cc: Andrew Duggan <aduggan@synaptics.com>,
+ Dmitry Torokhov <dmitry.torokhov@gmail.com>,
+ Benjamin Tissoires <benjamin.tissoires@redhat.com>,
+ =?UTF-8?q?Kamil=20P=C3=A1ral?= <kparal@redhat.com>
+Date: Thu, 28 Sep 2017 13:07:19 -0700
+
+In certain situations kernel tracking seems to be getting confused
+and incorrectly reporting the slot of a contact. On example is when
+the user does a three finger click or tap and then places two fingers
+on the touchpad in the same area. The kernel tracking code seems to
+continue to think that there are three contacts on the touchpad and
+incorrectly alternates the slot of one of the contacts. The result that
+is the input subsystem reports a stream of button press and release
+events as the reported slot changes.
+
+Kernel tracking was originally enabled to prevent cursor jumps, but it
+is unclear how much of an issue kernel jumps actually are. This patch
+simply disabled kernel tracking for now.
+
+Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1482640
+
+Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
+Tested-by: Kamil Páral <kparal@redhat.com>
+Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
+---
+ drivers/input/mouse/synaptics.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
+index 5af0b7d..ee5466a 100644
+--- a/drivers/input/mouse/synaptics.c
++++ b/drivers/input/mouse/synaptics.c
+@@ -1709,8 +1709,7 @@ static int synaptics_create_intertouch(struct psmouse *psmouse,
+ 		.sensor_pdata = {
+ 			.sensor_type = rmi_sensor_touchpad,
+ 			.axis_align.flip_y = true,
+-			/* to prevent cursors jumps: */
+-			.kernel_tracking = true,
++			.kernel_tracking = false,
+ 			.topbuttonpad = topbuttonpad,
+ 		},
+ 		.f30_data = {
diff --git a/kernel.spec b/kernel.spec
index 62e84e1ee..5277a0afc 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -685,6 +685,9 @@ Patch628: 3-3-inet-fix-improper-empty-comparison.patch
 # rhbz 1497861
 Patch629: 0001-platform-x86-peaq-wmi-Add-DMI-check-before-binding-t.patch
 
+# rhbz 1482648
+Patch630: Input-synaptics---Disable-kernel-tracking-on-SMBus-devices.patch
+
 # END OF PATCH DEFINITIONS
 
 %endif
@@ -2239,6 +2242,9 @@ fi
 #
 #
 %changelog
+* Tue Oct 10 2017 Justin M. Forbes <jforbes@fedoraproject.org>
+- Disable kernel tracking on SMBus devices (rhbz 1482648)
+
 * Mon Oct  9 2017 Peter Robinson <pbrobinson@fedoraproject.org>
 - Enable KASLR on aarch64