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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-12-12 00:05:53 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-06 14:17:00 -0800 |
| commit | 8246905d452b12e1ce535705c746c3ff66660e09 (patch) | |
| tree | f76f6df12d8298cae653e9f5d38ef694fb058bee | |
| parent | cc9894300313f95acc1f44580d96f7b4cb81afa3 (diff) | |
| download | linux-stable-8246905d452b12e1ce535705c746c3ff66660e09.tar.gz linux-stable-8246905d452b12e1ce535705c746c3ff66660e09.tar.bz2 linux-stable-8246905d452b12e1ce535705c746c3ff66660e09.zip | |
Input: synaptics - fix touchpad not working after S2R on Vostro V13
commit 8521478f67e95ada4e87970c7b41e504c724b2cf upstream.
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>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/input/mouse/synaptics.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index 5538fc657af1..767536372181 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -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> @@ -786,6 +787,16 @@ 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); |