Hello Incremental patch-4.9.227-228 break the ath9k_htc driver code. tested on two different laptops ASUS and HP (same era) Intel Core i3/i5 first generation, and with two generic USB Adapters. same prob with kernel 5.4.47 and other kernels might be impacted as well. dmesg : [ 295.375153] usb 2-1.2: new high-speed USB device number 5 using ehci-pci [ 295.474886] usb 2-1.2: New USB device found, idVendor=0cf3, idProduct=9271 [ 295.474896] usb 2-1.2: New USB device strings: Mfr=16, Product=32, SerialNumber=48 [ 295.474903] usb 2-1.2: Product: UB93 [ 295.474908] usb 2-1.2: Manufacturer: ATHEROS [ 295.474914] usb 2-1.2: SerialNumber: 12345 [ 295.475352] usb 2-1.2: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested [ 295.763801] usb 2-1.2: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008 [ 296.016274] ath9k_htc 2-1.2:1.0: ath9k_htc: HTC initialized with 33 credits [ 325.987036] ath9k_htc: Failed to initialize the device [ 325.987186] usb 2-1.2: ath9k_htc: USB layer deinitialized Best regards PS I am at your disposal for further information or tests to be launched and which could be useful.