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Some MT6639 Bluetooth USB interfaces (e.g. IMC Networks 13d3:3588 on ASUS ROG STRIX X870E-E and ProArt X870E-Creator boards) expose only a single alternate setting (alt 0) on the ISO interface. The driver unconditionally requests alt setting 1, which fails with EINVAL on these devices, causing a ~20 second initialization delay and no LE audio support. Check the number of available alternate settings before selecting one. If only alt 0 exists, use it; otherwise request alt 1 as before. Closes: https://github.com/jetm/mediatek-mt7927-dkms/pull/39 Signed-off-by: Javier Tia <floss@jetm.me> Reported-by: Ryan Gilbert <xelnaga@gmail.com> Tested-by: Ryan Gilbert <xelnaga@gmail.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>