linux-kernel - Re: IR remote stopped working in kernels 4.5 and 4.6

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Message-ID: <43cc65d3-7d9f-2ead-8a21-fcc6ee0d147e@gmail.com>
Date:	Mon, 4 Jul 2016 23:08:32 +0200
From:	Heiner Kallweit <hkallweit1@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-media@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: IR remote stopped working in kernels 4.5 and 4.6

Am 04.07.2016 um 22:36 schrieb James Bottomley:
> This looks to be a problem with the rc subsystem.  The IR controller in
> question is part of a cx8800 atsc card. In the 4.4 kernel, where it
> works, this is what ir-keytable says:
> 
> Found /sys/class/rc/rc0/ (/dev/input/event12) with:
> 	Driver cx88xx, table rc-hauppauge
> 	Supported protocols: other lirc rc-5 jvc sony nec sanyo mce-kbd rc-6 sharp xmp 
> 	Enabled protocols: lirc nec 
> 	Name: cx88 IR (pcHDTV HD3000 HDTV)
> 	bus: 1, vendor/product: 7063:3000, version: 0x0001
> 	Repeat delay = 500 ms, repeat period = 125 ms
> 
> And in 4.6, where it doesn't work:
> 
> Found /sys/class/rc/rc0/ (/dev/input/event12) with:
> 	Driver cx88xx, table rc-hauppauge
> 	Supported protocols: lirc 
> 	Enabled protocols: lirc 
> 	Name: cx88 IR (pcHDTV HD3000 HDTV)
> 	bus: 1, vendor/product: 7063:3000, version: 0x0001
> 	Repeat delay = 500 ms, repeat period = 125 ms
> 
> The particular remote in question seems to require the nec protocol to
> work and the failure in 4.5 and 4.6 is having any supported protocols
> at all.  I can get the remote to start working again by adding the nec
> protocol:
> 
> echo nec > /sys/class/rc/rc0/protocols
> 
> But it would be nice to have this happen by default rather than having
> to add yet another work around init script.
> 
Meanwhile decoder modules are loaded on demand only. This can be done
automatically w/o the need for additional init scripts.

If /etc/rc_maps.cfg includes a keymap with type NEC then the nec decoder
module is loaded automatically.

My rc_maps.cfg looks like this (and causes the SONY decoder module to be
loaded automatically):

#driver table                    file
*       *        sony-rm-sx800

And the keymap:

# table sony-rm-sx800, type SONY
0x110030        KEY_PREVIOUS
0x110031        KEY_NEXT
0x110033        KEY_BACK
..
..

Heiner

> James
> 
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