2 Rx with srsue USRP B210

[manudwd]

Issue Description

Attempting to receive IQ on 2 channels with usrp b210.

Setup Details

srsue Version 23.4.0
usrp: B210
ubuntu 20.04
Setting in ue.conf
nof_antennas = 2
device_args = num_recv_frames=64,num_send_frames=64,rx_subdev_spec=A:B A:A

Expected Behavior

Receive on both RX2A and RX2B

Actual Behavior

Only received on RX2B, if providing rx_subdev_spec=A:A A:B, then receive on RX2A only, both of the antenna channels are recognized. Since the only options for rx_subdev_spec are A:A or A:B I have exhaustively used all combinations. I not providing the rx_subdev_spec argument, then only receiving on the RX2A by default.

Individual behavior is as expected by setting
nof_antennas = 1 and
rx_subdev_spec=A:B for RX2B
rx_subdev_spec=A:A for RX2A

Steps to reproduce the problem

sudo add-apt-repository ppa:srslte/releases
sudo apt-get update
sudo apt-get install srsue

Use attached ue.conf (attached as .txt instead
ue_2rx.txt
), change earfcn to any feasible TDD or FDD band. Only USRP B210, add antenna element on RX2A and RX2B.