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

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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>
This commit is contained in:
Dmitry Torokhov 2011-12-12 00:05:53 -08:00
parent 3a7f8fb1d8
commit 8521478f67
1 changed files with 11 additions and 0 deletions
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11
drivers/input/mouse/synaptics.c
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@ -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);