Alt+Shift+S does close the volume/brightness slider immediately, but agreed that it should instead open the system menu.

Huh, that's changed since I opened the bug then :)

There's some really weird inconsistencies in this bit of the UI in general. For example, try pressing alt-shift-S, then alt-shift-N -- the message centre opens in front of the system menu, which is kind of odd (this also works the other way around). Then press Esc, and the system menu closes, but not the message centre (in fact the message centre will not close in response to an Esc press at all). However, if you open either of the system menu or message centre by mouse rather than keyboard shortcut, they will not open in front of each other.

Also, whilst alt-shift-S closes the volume/brightness sliders, alt-shift-N doesn't -- press Mute, then press alt-shift-N twice quickly, and the volume slider will still be visible.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

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Bulk-assigning unassigned status area bugs to me.