Comment 3 for bug 1799102

Host information:

OS: Xubuntu 18.04.1 (amd64);
Kernel: 4.17.19 with 337fe9f5c1e7de1f391c6a692531379d2aa2ee11 applied to fix https://bugs.freedesktop.org/show_bug.cgi?id=107899;
QEMU: 3.0.0;

QEMU command line:

env PULSE_LATENCY_MSEC=5 QEMU_AUDIO_ADC_VOICES=0 QEMU_AUDIO_DRV=pa qemu-system-x86_64 \
-name "Ubuntu Cosmic" -k pt-br -nodefaults -enable-kvm -cpu host -smp cores=2,threads=2 -m 2G \
-device vfio-pci,sysfsdev=/sys/bus/pci/devices/0000:00:02.0/ef5f4cb6-734b-11e8-aaff-9fff2622012e,rombar=0,display=on,x-intx-mmap-timeout-ms=0x200,addr=0x3,id=iHD520 \
-device qemu-xhci,id=xhcihub -device usb-tablet,id=usbtablet -device usb-audio,id=usbaudio,buffer=6144 -bios /usr/share/ovmf/OVMF.fd \
-display gtk,gl=on -hda ubuntucosmic.qcow2 -monitor vc -serial mon:stdio \
-machine kernel_irqchip=on -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -M pc,usb=true \
-netdev user,id=net0,hostfwd=::5454-:22 -device e1000,netdev=net0,addr=8