Tag Archives: debian

Arduino Keyboard library not working on Debian KDE

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Man, I just spent quite a bit of time diagnosing this particular issue.

The problem was that my Symbol Keyboard stopped working. This is a USB keyboard I made from an Arduino Leonardo. The touch screen was working okay, but the keypresses weren’t being delivered over USB.

Long story short, the 7-port USB 3.0 hub attached to my workstation needed rebooting! I disconnected the power supply and disconnected the upstream USB cable to remove both sources of power, then when I reconnected everything my stuff started working again, including my symbol keyboard.

Lesson learned: if you’re debugging a USB device failure try plugging the device directly into the host to avoid any potential issues caused by your hub(s).

It was lucky I had a spare 104-key USB keyboard in the cupboard because I needed one while diagnosing this issue (the Windows box I was using only has a tenkeyless 87-key keyboard plugged into it but the Windows alt-key codes require use of the number pad).

The latest incarnation of my symbol keyboard looks like this:

John's symbol keyboard

Getting info about recent core dump (on Debian)

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This is a note for Future John about how to report a recent coredump (with debugging symbols) on Debian:

DEBUGINFOD_URLS="https://debuginfod.debian.net" coredumpctl gdb

Then bt is a magical gdb command to run to give you the call stack of the thread which… failed?

Extra Content #2: Motherboard upgrade from ASUS PRIME B550M-A to ASUS ProArt B550-CREATOR

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This post is part of my video blog: In The Lab With Jay Jay.

You can support this channel on Patreon: patreon.com/JohnElliotV

This is a long and unedited video of me upgrading my computer from ‘longing’ https://www.jj5.net/sixsigma/Longing to ‘lore’ https://www.jj5.net/sixsigma/Lore

As I said today was computer upgrade day. I made a video of me doing the upgrade, it runs for about two hours: Motherboard upgrade from ASUS PRIME B550M-A to ASUS ProArt B550-CREATOR. It was pretty uneventful and so far it seems to have been successful too. Yay.

Thanks very much for watching! And please remember to hit like and subscribe! :)

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

aToolTour Black Hexagon Deburring Drill BitThis is an image of the product.notes

Let’s go shopping!

A folder named ~/.cache/kioexec/krun/13821_0/ already exists

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2017-12-09 jj5 – TODO: document this on my blog…

On Debian GNU/Linux 9.1 (stretch) when I try to open an *.desktop (application/x-desktop) link in a browser I get:

A folder named ~/.cache/kioexec/krun/13821_0/ already exists.

Searching for:

A folder named kioexec krun already exists

turned up diddly squat.

I solved the issue (for me) by changing:

System Settings -> Personalization -> Applications -> Default Application s-> Web Browser

from:

Open http and https URLs in an application based on the contents of the URL

to:

Open http and https URLs in the following browser: firefox