From 8521478f67e95ada4e87970c7b41e504c724b2cf Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Mon, 12 Dec 2011 00:05:53 -0800 Subject: [PATCH] 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 Tested-by: Daniel Manrique Cc: stable@kernel.org Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/synaptics.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index c080b828e5d..a6dcd18e9ad 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -24,6 +24,7 @@ */ #include +#include #include #include #include @@ -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); -- 2.20.1