FWIW, hotkey-setup seems to be responsible for drawing the volume popup (see #88029), so might be responsible for this popup as well.
-- Screen Brightness Little Pop-up window does not show the correct Brightness on a Thinkpad x60 https://launchpad.net/bugs/71204 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
