OS X 10.8 polls UAC 1.0 sync endpoint at twice the bRefresh rate
OS X 10.8 polls UAC 1.0 sync endpoint at twice the bRefresh rate
- Subject: OS X 10.8 polls UAC 1.0 sync endpoint at twice the bRefresh rate
- From: Dominik Peklo <email@hidden>
- Date: Sun, 29 Jul 2012 11:27:43 +0800
It seems either the main USB host driver, or the USB Audio Class driver in Mountain Lion misses the mark on iso IN sync endpoint's bRefresh polling interval. It issues IN transfers twice as often as the descriptor says, causing my USB Audio products to fail to regulate data flow and produce periodic pops due to buffer under/overruns.
Best Regards,
Dominik Peklo
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