Figured it out: running /usr/lib/notification-daemon/notification-daemon
solves the issue.
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https://bugs.launchpad.net/bugs/1746277
Title:
Very long delay in responding to volume keys
With "unity-settings-daemon --debug -r" for changing screen brightness, I'm
getting
(unity-settings-daemon:3474363): libnotify-WARNING **: 01:08:12.601: Failed to
connect to proxy
(unity-settings-daemon:3474363): media-keys-plugin-WARNING **: 01:08:12.603:
Failed to get old screen percentage:
I'm getting those strange log lines:
Jan 10 00:55:08 user-Lenovo-ideapad-320S-15IKB
org.freedesktop.Notifications[3468614]: org.kde.knotifications: WaitForName:
Service was not registered within timeout
Jan 10 00:55:08 user-Lenovo-ideapad-320S-15IKB dbus-daemon[2433]: [session
uid=1000
I have the same bug after upgrading Focal:
https://askubuntu.com/questions/1301972/hotkeys-respond-lag-updating-notification-area-player-lags-wi-fi-icon-update-s
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