This is a note to let you know that I've just added the patch titled Input: do not emit unneeded EV_SYN when suspending to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: input-do-not-emit-unneeded-ev_syn-when-suspending.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 00159f19a5057cb779146afce1cceede692af346 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Date: Thu, 6 Aug 2015 19:15:30 -0700 Subject: Input: do not emit unneeded EV_SYN when suspending From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> commit 00159f19a5057cb779146afce1cceede692af346 upstream. Do not emit EV_SYN/SYN_REPORT on suspend if there were no keys that are still pressed as we are suspending the device (and in all other cases when input core is forcibly releasing keys via input_dev_release_keys() call). Reviewed-by: Benson Leung <bleung@xxxxxxxxxxxx> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Signed-off-by: Bo Hu <bohu@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> diff --git a/drivers/input/input.c b/drivers/input/input.c index 78d24990a816..5391abd28b27 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -674,13 +674,19 @@ EXPORT_SYMBOL(input_close_device); */ static void input_dev_release_keys(struct input_dev *dev) { + bool need_sync = false; int code; if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { - for_each_set_bit(code, dev->key, KEY_CNT) + for_each_set_bit(code, dev->key, KEY_CNT) { input_pass_event(dev, EV_KEY, code, 0); + need_sync = true; + } + + if (need_sync) + input_pass_event(dev, EV_SYN, SYN_REPORT, 1); + memset(dev->key, 0, sizeof(dev->key)); - input_pass_event(dev, EV_SYN, SYN_REPORT, 1); } } Patches currently in stable-queue which might be from dmitry.torokhov@xxxxxxxxx are queue-3.18/input-do-not-emit-unneeded-ev_syn-when-suspending.patch