On Sat, 15 Jun 2019 18:50 -07:00, Valdis Klētnieks <valdis.kletnieks@vt.edu> wrote:

On Sat, 15 Jun 2019 12:38:34 -0700, "Alexander Ivanov" said:

> This is fedora 25 running 4.8.6 kernel.

It probably won't fix the problem, but you should upgrade if at all possible.
You're not getting any security patches for 25. 30 is the current release,
with 31 due out fairly soon.

I know. However, it isn't up to me. We have hundreds such units and I heard about plans to upgrade to 30 'soon'. I'm going to give it a try with 30 on my development board, just out of curiosity. For the problem at hand though, I'd likely have to find an external GPIO board that can generate an interrupt on GPIO pin toggle.

Anyway, thanks for trying to help.