Commit 8521478f authored Dec 12, 2011 by Dmitry Torokhov

Input: synaptics - fix touchpad not working after S2R on Vostro V13



Synaptics touchpads on several Dell laptops, particularly Vostro V13
systems, may not respond properly to PS/2 commands and queries immediately
after resuming from suspend to RAM. This leads to unresponsive touchpad
after suspend/resume cycle.

Adding a 1-second delay after resetting the device allows touchpad to
finish initializing (calibrating?) and start reacting properly.

Reported-by: Daniel Manrique <daniel.manrique@canonical.com>
Tested-by: Daniel Manrique <daniel.manrique@canonical.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

parent 3a7f8fb1

drivers/input/mouse/synaptics.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		*/

		#include <linux/module.h>
		#include <linux/delay.h>
		#include <linux/dmi.h>
		#include <linux/input/mt.h>
		#include <linux/serio.h>
		@@ -1220,6 +1221,16 @@ static int synaptics_reconnect(struct psmouse *psmouse)

		do {
		psmouse_reset(psmouse);
		if (retry) {
		/*
		* On some boxes, right after resuming, the touchpad
		* needs some time to finish initializing (I assume
		* it needs time to calibrate) and start responding
		* to Synaptics-specific queries, so let's wait a
		* bit.
		*/
		ssleep(1);
		}
		error = synaptics_detect(psmouse, 0);
		} while (error && ++retry < 3);