reTerminal gpio_keys not found

We have number of reTerminal, and on one the front-buttons do not work. The issue persists across various OS and all devices are configured identically.

Expected:

/dev/input/event0:      seeed-tp
/dev/input/event1:      gpio_keys
/dev/input/event2:      vc4
/dev/input/event3:      vc4

Actual:

/dev/input/event0:      seeed-tp
/dev/input/event1:      vc4
/dev/input/event2:      vc4

Any suggestions how I can troubleshoot the missing gpio_keys?

I have a dependency on the front hardware buttons, so I’ve stuck with the previous 2021-09-13-Raspbian-reTerminal.img OS image. They work in this image.

However, reTerminal Raspbian images beyond this do not have have the GPIO keys enabled for whatever reason. I haven’t had the time to do this, but you could decompile the dt overlay blobs from the working and non-working OS images and do a diff as a starting point for troubleshooting.

Until Seeed fixes the issue in the latest OS release, I’m going to stick to the 2021-09-13-Raspbian-reTerminal.img image as it works in that release.

Observation with 2021-09-13-Raspbian-reTerminal.img

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 5.10.60-v7l+ #1449 SMP Wed Aug 25 15:00:44 BST 2021 armv7l GNU/Linux

pi@raspberrypi:~ $ tree /dev/input/
/dev/input/
├── by-path
│   ├── platform-fe804000.i2c-event -> ../event0
│   ├── platform-fef00700.hdmi-event -> ../event3
│   ├── platform-fef05700.hdmi-event -> ../event4
│   ├── platform-gpio_keys-event -> ../event1
│   └── platform-lis3lv02d-event -> ../event2
├── event0
├── event1
├── event2
├── event3
├── event4
├── js0
├── mice
└── mouse0

Observation with a recent release

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 5.15.32-v7l+ #1538 SMP Thu Mar 31 19:39:41 BST 2022 armv7l GNU/Linux

pi@raspberrypi:~ $ tree /dev/input
/dev/input
├── by-path
│   ├── platform-fe804000.i2c-event -> ../event1
│   ├── platform-fef00700.hdmi-event -> ../event2
│   ├── platform-fef05700.hdmi-event -> ../event3
│   └── platform-lis3lv02d-event -> ../event0
├── event0
├── event1
├── event2
├── event3
├── js0
├── mice
└── mouse0

1 directory, 11 files

Thanks for pointing this out; I wasn’t aware.

However, as mentioned in my first message, all our reTerminal work just fine (gpio_keys recognized) across various OS (Raspbian, PantherX). It’s just this one reTerminal that does not work, no matter which OS or configuration I try.

Almost like a hardware fault, but I don’t think so.

It’s definitely not a hardware fault, it’s some kind of configuration issue - the same unit that has working gpio-keys, will fail to work when using a more recent Raspbian reTerminal image.

Hi, we have updated the Wiki and you can follow the instructions here to try the custom button settings again. Looking forward to your new news.