A couple of times lately, unity appears to not accept button presses from neither the mouse or the keyboard.

This happens after a random amount of time, usually a couple of hours, or right after boot.

The weird thing is:

• I can still move the mouse around.
• I can press alt to get the unity menu thingy (but i can't type anything in it)
• I can press super to show/hide the unity search.
• None of the applications seem to get the input
• Ive tried connecting a second mouse, same issue
• I can press ctrl+alt+f1 to drop to a shell tty
• The shell works fine

Now, this is definitely a bug, probably in unity(?), but it's hard to search for when I don't know what's causing it. Is there something I can do to debug?

I've found some people that appears to be having the same problem with the mouse only, but most of the time, their questions are unanswered or closed for being too specific.

What would be a good strategy to fix this? Should I report it as a bug?