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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1467664616.2288.12.camel@HansenPartnership.com>
Date:	Mon, 04 Jul 2016 13:36:56 -0700
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	linux-media@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: IR remote stopped working in kernels 4.5 and 4.6

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.

James