这个问题让我有点困惑。请注意，这是 20.04 的全新安装，而不是升级。
该问题可以概括为：
- 任何时候，如果我尝试使用键盘的音量键，音量才会真正改变，并且音量指示器才会显示在屏幕上，这时会有明显的延迟（2 到 5 秒之间）。
- 以这种方式更改音量后的任何时候，Ubuntu 都需要大约相同的时间来响应我的第一个正常键盘事件（例如键入一个字母），之后它就会正常运行。
- 这几乎就像 Ubuntu 必须在“音量状态”和“正常输入状态”之间切换一样。
我在更改音量时擅自跟踪系统日志，然后正常使用键盘，并看到了以下输出：
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 38 with keysym 38 (keycode 11).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 32 with keysym 32 (keycode b).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 31 with keysym 31 (keycode a).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 33 with keysym 33 (keycode c).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 39 with keysym 39 (keycode 12).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 34 with keysym 34 (keycode d).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 35 with keysym 35 (keycode e).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 36 with keysym 36 (keycode f).
Apr 27 16:01:53 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 37 with keysym 37 (keycode 10).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 38 with keysym 38 (keycode 11).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 32 with keysym 32 (keycode b).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 31 with keysym 31 (keycode a).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 33 with keysym 33 (keycode c).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 39 with keysym 39 (keycode 12).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 34 with keysym 34 (keycode d).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 35 with keysym 35 (keycode e).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 36 with keysym 36 (keycode f).
Apr 27 16:02:12 StuartUbuntu gnome-shell[1743]: Window manager warning: Overwriting existing binding of keysym 37 with keysym 37 (keycode 10).