Hi, after updating to 5.2 the wi-fi driver stopped working when the iommu is enabled. It fails to list the available wi-fi networks or connect to a known one. booting with amd_iommu=off works around the problem. The staging version in 5.1 and older worked OK with the iommu enabled The device is: 04:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8822BE 802.11a/b/g/n/ac WiFi adapter I do see an IOMMU error in dmesg, but the originating device does not match the nics pci location: Jul 08 15:03:14 host kernel: rtw_pci 0000:04:00.0: start vif xx:xx:xx:xx:xx:xx on port 0 Jul 08 15:03:14 host kernel: iommu ivhd0: AMD-Vi: Event logged [INVALID_DEVICE_REQUEST device=00:00.1 pasid=0x00000 address=0xfffffffdf8140200 flags=0x0a00] Jul 08 15:03:14 host kernel: rtw_pci 0000:04:00.0: stop vif xx:xx:xx:xx:xx:xx on port 0 Jul 08 15:03:14 host NetworkManager[790]: <info> [1562612594.8992] device (wlp4s0): set-hw-addr: set MAC address to yy:yy:yy:yy:yy:yy (scanning) Jul 08 15:03:15 host kernel: rtw_pci 0000:04:00.0: start vif yy:yy:yy:yy:yy:yy on port 0 let me know if I should provide any further info. thanks, Jan
