IR remote control autorepeat / evdev

Mauro Carvalho Chehab mchehab at
Wed May 11 18:36:47 PDT 2011

Em 12-05-2011 03:10, Mauro Carvalho Chehab escreveu:
> Em 12-05-2011 02:37, Anssi Hannula escreveu:

>> I don't see any other places:
>> $ git grep 'REP_PERIOD' .
>> dvb/dvb-usb/dvb-usb-remote.c:   input_dev->rep[REP_PERIOD] =
>> d->props.rc.legacy.rc_interval;
> Indeed, the REP_PERIOD is not adjusted on other drivers. I agree that we
> should change it to something like 125ms, for example, as 33ms is too 
> short, as it takes up to 114ms for a repeat event to arrive.
IMO, the enclosed patch should do a better job with repeat events, without
needing to change rc-core/input/event logic.


Subject: Use a more consistent value for RC repeat period
From: Mauro Carvalho Chehab <mchehab at>

The default REP_PERIOD is 33 ms. This doesn't make sense for IR's,
as, in general, an IR repeat scancode is provided at every 110/115ms,
depending on the RC protocol. So, increase its default, to do a
better job avoiding ghost repeat events.

Signed-off-by: Mauro Carvalho Chehab <mchehab at>

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index f53f9c6..ee67169 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1044,6 +1044,13 @@ int rc_register_device(struct rc_dev *dev)
 	dev->input_dev->rep[REP_DELAY] = 500;
+	/*
+	 * As a repeat event on protocols like RC-5 and NEC take as long as
+	 * 110/114ms, using 33ms as a repeat period is not the right thing
+	 * to do.
+	 */
+	dev->input_dev->rep[REP_PERIOD] = 125;
 	path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
 	printk(KERN_INFO "%s: %s as %s\n",

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