The bTerminalLink field must refer to a Terminal Entity in the topology and its value must be identical in all alternate settings of an AS interface. For Type I formats, exactly one bit must be set to one in the bmFormats field of the AS interface descriptor. Otherwise, the format will be ignored by the driver. To save bus bandwidth, one AS interface can implement multiple alternate settings with the same format in terms of bNrChannels and AS Format Type Descriptor but different wMaxPacketSize values in the isochronous data endpoint descriptor.
For a given sample rate, the driver selects the alternate setting with the smallest wMaxPacketSize that can fulfill the data rate requirements. The driver supports a subset of the control requests defined in ADC-2, section 5.
The following table shows the subset that is implemented in the driver. Each subrange describes a discrete frequency, or a frequency range.
Individual subranges must not overlap. If a subrange overlaps a previous one, it will be ignored by the driver. The USB Audio 2. The driver supports one single volume range only. If a feature unit implements single channel controls as well as a master control for Mute or Volume, then the driver uses the single channel controls and ignores the master control. There is not any specific partner customization that is associated with the in-box USB Audio 2. This INF file entry provided in a update to Windows Release , is used to identify that the in-box driver is a generic device driver.
USB Audio 2. An arbitrary number of channels greater than eight are not supported in shared mode due to a limitation of the Windows audio stack. The example is for a non-composite device with single feature descriptor. If the driver does not start, the system event log should be checked. The driver logs events which indicate the reason for the failure. Similarly, audio logs can be manually collected following the steps described in this blog entry.
If the failure may indicate a driver problem, please report it using the Feedback Hub described below, and include the logs.
For information on how to read logs for the USB Audio 2. I'm using the digital output of the card, and some of the card's Control panel functionalities do not work. My computer? The computer crashes when I use certain software. What is the 'MP3 Hardware acceleration' option available in the control panel, and how can I use it? When installing drivers under Windows XP, a warning message appears indicating that the drivers have not been approved.
Where can I find Linux drivers for my card? Where can I find the serial numbers for the software included with my sound card? Why and how can I disable my onboard sound card? Why can't I get sound from all speakers when I connect my 6.
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