To use Win+Left/Right to adjust volume, I have this in .Xmodmap: keysym Left = Left Left Left XF86AudioLowerVolume keysym Right = Right Right Right XF86AudioRaiseVolume However, with this setting, kglobalaccel grabs all the combinations of modifiers with the left key. This prevents using the left/right key for normal text input. I understand that you want volume keys to work with any modifier, but kglobalaccel should only grab combinations of modifiers which includes the original modifier, i.e., you should only grab meta + left + (other modifiers). A workaround is just specifying Meta+Left/Right in Shortcuts setting, but this does not work across desktop environments.
I'm sorry, but that is quite a corner case and I doubt we can fix it. Kglobalaccel performs an XGrabKey (see https://tronche.com/gui/x/xlib/input/XGrabKey.html ) with the XF86AudioLowerVolume as key. In your case it seems that core X grabs it for too many cases. There is not much we can do here about that. Also I must say that the X11 implementation of KGlobalAccel is rather unmaintained since I switched to Wayland. On the other hand I consider it as very likely that this issue is not present on Wayland at all.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!