Keyboard input broken after FS-UAE window gets focus

[punktniklas]

I just updated to FS-UAE 2.8.0 from 2.6.2 on Ubuntu Linux. When starting up an Amiga instance keyboard input works fine. But then I do this:

• Release mouse/keyboard input by clicking the mouse wheel
• Activate some other window in Linux
• Reactivate FS-UAE

Now keyboard input is broken. Sometimes keys get interpreted as return/linefeed. Sometimes I get control codes like ^I. Sometimes the shell window just blinks. Switching focus back and forth doesn't seem to help.

[punktniklas]

Update: It seems like it only breaks when I switch workspace and activate a window there (which usually happens automatically when switching workspaces). Then when I switch back to the workspace where FS-UAE is running the keyboard input is broken.

If I stay within the same workspace I can activate windows back and forth without anything breaking.

[FrodeSolheim]

Do you switch workspace by using keyboard shortcuts, if so, what? (and what window manager are you using? Unity?)

[punktniklas]

Yes, I switch by using Ctrl-Alt-Arrow, which is the default in Ubuntu. And yes, it's the default Unity window manager.

[FrodeSolheim]

I believe the problem is caused by you holding the ctrl and alt keys when the desktop is changed (FS-UAE loses focus). FS-UAE then does not realize that you are no longer holding the keys when it gets the focus back. That is probably a bug in FS-UAE (it should probably check the state of all keys when it gets the focus back).

Please try this, when you reactivate FS-UAE and you trigger the bug. Please try to press and release Ctrl once, and press and release Alt once. Does problem go away then?

[punktniklas]

Yes, that makes the problem go away!

[FrodeSolheim]

FS-UAE should probably run some code to try to sync keyboard state whenever the window gets focus. This is probvably still an issue in the upcoming 4.0 version.