[mythtv-users] Remote keys repeating way too fast

Fri Apr 16 10:04:20 UTC 2021

On Fri, 16 Apr 2021 02:44:12 +0000, you wrote:

>Hi All,
>    Apologies for the earlier incomplete post, I hit the send key
>    by accident.
>
>    I just did an apt-upgrade of my ubuntu 20.10 mythtv 0.31 server and
>    suddenly my hard won lircd setup has started repeating keys when I
>    use my generic Microsoft Media Center remote.
>
>    The update updated mythtv to 31.0+fixes.202103051941.6c7c8b0351 and
>    the kernel version to 5.8.0-45-generic #51 so I'm not sure if the
>    problem was due to mythtv, the kernel or some other package update.
>    Lirc was not updated and remains at 0.10.1[1087].
>
>    I wanted to take lircd out of the equation and see if the problem
>    lies with the kernel's dev-input layer, so I shutdown lircd and
>    ran evtest to see if the remote's keys generated the repeats.
>
>        root at lisa:~# systemctl stop lircd
>        root at lisa:~# evtest
>        No device specified, trying to scan all of /dev/input/event*
>        Available devices:
>        /dev/input/event0:      Power Button
>        ... lines omitted for brevity
>        /dev/input/event16:     Media Center Ed. eHome Infrared Remote Transceiver (0471:060c)
>        Select the device event number [0-16]: 16
>        Input driver version is 1.0.1
>        Input device ID: bus 0x3 vendor 0x471 product 0x60c version 0x101
>        Input device name: "Media Center Ed. eHome Infrared Remote Transceiver (0471:060c)"
>        Supported events:
>          Event type 0 (EV_SYN)
>          Event type 1 (EV_KEY)
>            Event code 2 (KEY_1)
>            Event code 3 (KEY_2)
>            Event code 4 (KEY_3)
>            ... lines omitted for brevity
>        Key repeat handling:
>          Repeat type 20 (EV_REP)
>            Repeat code 0 (REP_DELAY)
>              Value    500
>            Repeat code 1 (REP_PERIOD)
>              Value    125
>        Properties:
>          Property type 5 (INPUT_PROP_POINTING_STICK)
>        Testing ... (interrupt to exit)
>            Event: time 1618540114.824036, type 4 (EV_MSC), code 4 (MSC_SCAN), value 800f0421
>            Event: time 1618540114.824036, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 1
>            Event: time 1618540114.824036, -------------- SYN_REPORT ------------
>            Event: time 1618540114.931034, type 4 (EV_MSC), code 4 (MSC_SCAN), value 800f0421
>            Event: time 1618540114.931034, -------------- SYN_REPORT ------------
>            Event: time 1618540115.037033, type 4 (EV_MSC), code 4 (MSC_SCAN), value 800f0421
>            Event: time 1618540115.037033, -------------- SYN_REPORT ------------
>            Event: time 1618540115.143035, type 4 (EV_MSC), code 4 (MSC_SCAN), value 800f0421
>            Event: time 1618540115.143035, -------------- SYN_REPORT ------------
>            Event: time 1618540115.338814, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 2
>            Event: time 1618540115.338814, -------------- SYN_REPORT ------------
>            Event: time 1618540115.474815, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 2
>            Event: time 1618540115.474815, -------------- SYN_REPORT ------------
>            Event: time 1618540115.606815, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 2
>            Event: time 1618540115.606815, -------------- SYN_REPORT ------------
>            Event: time 1618540115.738815, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 2
>            ... repeating lines omitted for brevity ...
>            Event: time 1618540127.938815, -------------- SYN_REPORT ------------
>            Event: time 1618540127.938815, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 0
>            Event: time 1618540127.938815, -------------- SYN_REPORT ------------
>
>    One key press of the right arrow key on the remote generated
>    around 96 KEY_DOWN events.
>
>    I tried playing with ir-keytable's -D and -P options but this just slowed down the
>    repeats and I still got around ~96 repeats. It doesn't matter which key I hit either.
>
>    If I start up lircd, irw reports the same issue as I understand it simply reading 
>    from the kernel input layer.
>
>    I even upgraded the kernel from 5.8.0-45-generic #51 to 5.8.0-50 #56 in the hope
>    that the problem in the input layer might already have been fixed... but no joy.
>
>    Any thoughts hugely appreciated.
>
>Cheers,
>
>Doug

It looks like a kernel devinput driver problem, so I think the obvious
fix is to go back to the last kernel that worked, if you can.

I have a Ubuntu 20.04 box that has a tuner with IR receiver on it that
is running a 5.8.0-49 HWE kernel, but not a working copy of MythTV.
When I press any button on its Hauppauge remote (RC-5 instead of RC-6
for MCE remotes), I get infinite repeats of the button press.  That
box still has a 5.4.0-72 non-HWE kernel on it, so I rebooted to that
and the repeats problem did not happen there.  I rebooted back to
5.8.0-49 and did the waiting upgrade to 5.8.0-50 and tried that, but
it had the problem too.

If you do a bug report (recommended), you may want to do a kernel
bisect to see where the problem first started.  At the moment, it
could be anywhere between 5.4.0-49 and 5.8.0-45.

And it looks like anyone using MythTV with an IR remote needs to not
upgrade to a 5.8 kernel until this is fixed.  Which is a pain as my
test PC with MythTV Master on it has already been upgraded to 5.8 - it
is just that I have not tried Master with a real tuner and IR remote
yet, just SAT>IP network tuners.