Hi, thanks for a prompt reply. the patch applies with minor changes (the LPS mod param message and -2 lines offsets), but it works. The system now lists available wi-fi networks and connects to known networks all while the iommu is enabled. feel free to add my tested-by, regards, Jan On Wed, Jul 10, 2019 at 1:12 AM Tony Chuang <yhchuang@xxxxxxxxxxx> wrote: > > > 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 > > > > > Hi, > > I am not sure if enabling MSI interrupt is going to help. > You can try the patch attached, if it works, I will send it to upstream. > Thanks > > Yan-Hsuan
