I've got the same issue. Had to rollback to 1809. The working driver is named: 10.0.17763.1 (WinBuild.160101.0800) from 14th sept 2018
The non-working driver is: 10.0.18362.1 (WinBuild.160101.0800) from 18th march 2019 My versions (both tested): $ /opt/qemu4/bin/qemu-system-x86_64 --version QEMU emulator version 4.1.0 Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers $ qemu-system-x86_64 --version QEMU emulator version 3.1.1 (qemu-3.1.1-2.fc30) Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers My qemu startup line is: /path/to/correct/qemu-system-x86_64 \ -runas idarlund \ -name win10,process=win10 \ -machine type=q35,accel=kvm,kernel_irqchip=on \ -cpu host,kvm=off,hv_vendor_id=1234567890ab,hv_vapic,hv_time,hv_relaxed,hv_spinlocks=0x1fff,l3-cache=on,-hypervisor,migratable=no,+invtsc \ -smp 12,sockets=1,cores=12,threads=1 \ -m 24G \ -rtc clock=host,base=localtime \ -vga none \ -nographic \ -serial none \ -parallel none \ -usb \ -soundhw hda \ -device vfio-pci,host=2a:00.0,multifunction=on \ -object input-linux,id=mouse1,evdev=/dev/input/by-id/usb-Logitech_Gaming_Mouse_G402_6D8A12705348-event-mouse \ -object input-linux,id=kbd1,evdev=/dev/input/by-id/usb-Logitech_HID_compliant_keyboard-event-kbd,grab_all=on,repeat=on \ -device ivshmem-plain,memdev=ivshmem,bus=pcie.0 \ -object memory-backend-file,id=ivshmem,share=on,mem-path=/dev/shm/looking-glass,size=128M \ -audiodev pa,id=pa1,server=/run/user/1000/pulse/native \ -drive if=pflash,format=raw,readonly,file=/usr/share/OVMF/OVMF_CODE.fd \ -drive if=pflash,format=raw,file=/tmp/my_vars.fd \ -boot order=dc \ -drive id=disk0,if=virtio,cache=none,format=qcow2,aio=threads,file=/var/lib/libvirt/images/windowstest.qcow2 \ -netdev type=bridge,id=net0,br=virbr1 \ -device e1000,netdev=net0,mac=00:16:3e:00:08:02 I'm not sure if this bug report should be reported to qemu tho. We should probably file a bug report to Microsoft as well. ** Also affects: fedora Importance: Undecided Status: New ** No longer affects: fedora -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1839060 Title: HDA device non functional in Windows 10 1903 Status in QEMU: New Bug description: I made the update to 1903, and the HDA device stopped working. The driver says the device is working correctly, but it does not. When I try to open the Windows sound configuration, the dialog hangs and never shows it's content. Several people reported this back in May: https://windowsreport.com/windows-10-v1903-ich6-ich9-virtio/ I can confirm I have exactly the same problem. Host is Arch Linux, current (5.2.5) kernel, QEMU 4.0. I enabled HDA debug output and compared an older, working Windows version to 1903, but could not see the difference. The driver seems to issue the same verbs. I am happy to provide additional information if needed. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1839060/+subscriptions