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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>
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@ -24,6 +24,7 @@
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#include <linux/input/mt.h>
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#include <linux/serio.h>
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@ -1220,6 +1221,16 @@ static int synaptics_reconnect(struct psmouse *psmouse)
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do {
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psmouse_reset(psmouse);
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if (retry) {
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/*
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* On some boxes, right after resuming, the touchpad
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* needs some time to finish initializing (I assume
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* it needs time to calibrate) and start responding
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* to Synaptics-specific queries, so let's wait a
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* bit.
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*/
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ssleep(1);
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}
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error = synaptics_detect(psmouse, 0);
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} while (error && ++retry < 3);
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