From time to time in HL2 Multiplayer the tinnitus sound continues to play after being killed by an explosive. This happens with a probability of about once every 100 deaths by an explosive, and needs a reconnect to the server.
This issue predates the Linux beta, and also happens on Windows.
As a workaround, it might make sense to make sure the tinnitus sound is forced to fade out when the player respawns.