First of all, sorry if this is incorrect place to report firmware issues. Since commit [1] communication between rtl8761bu and Xbox Series X controllers is very unstable. There are frequent reconnects that makes the rtl8761bu controller unusable. Reverting mentioned commit fixes this issue. Xbox Series X controller is tested with several latest BLE firmwares. There are no any errors in the kernel log. This issue was also reported to xpadneo driver [2] [1] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=1de22a39246513ce431de0971a6376093a94c5c1 [2] https://github.com/atar-axis/xpadneo/issues/492
The device in question: Bus 005 Device 089: ID 0bda:8771 Realtek Semiconductor Corp. Bluetooth Radio
I'll try to submit updated firmware to linux-firmware