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When sinks are compared during the default sink selection, the active port's availability is inspected. Therefore, the default sink should be updated when the active port changes, because the new port may have different availability status than the old port. For example, let's say that a laptop has an analog sink with a speaker and a headphone port, and headphones are initially plugged in, so both ports can be used[1]. The headphone port is initially the active port. There's also a null sink in the system. When the headphones are unplugged, the headphone port becomes unavailable, and the null sink becomes the new default sink. Then module-switch-on-port-available changes the analog sink port to speakers. Now the default sink should change back to the analog sink, but that doesn't happen without this patch. [1] Actually we currently mark speakers as unavailable when headphones are plugged in, but that's not strictly necessary. My example relies on both ports being available initially, so the bug can't be reproduced with the current mixer configuration. |
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