I’ve kept going since posting this, still without a resolution. Wanted to share what I’ve tried and a few other notes.
- I’ve tried changing USB ports, and that doesn’t seem to help.
- I don’t think this is a 2.4GHz wireless interference issue because my 2.4GHz mouse is reasonably reliable. If there were interference, I would think I would also have issues with it.
- I’ve looked at dmesg, and it doesn’t show any new log entries when the keyboard loses connectivity.
- Disconnecting and reconnecting the dongle fixes the problem… until the keyboard loses connectivity again.
- The keyboard does not seem to lose connectivity when connected up to my macOS system.
- I’ve tried powertop to see if anything up the chain still has autosuspend enabled. Went through tunables and disabled power management (i.e., toggled to “Bad”) for both of the xHCI host controllers just in case that might cause it, but it didn’t help.
Not sure where to go next with this one, but it’s really annoying. 