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+jack audio dev produces no sound
+
+Hi,
+
+I'm testing the new jack audiodev backend in my
+laptop. The host system is gentoo, using the
+ebuild for qemu 5.1.0-r2, and I'm using jack
+use flag globally in the system so any ebuild
+that have support for jack should be build with
+it. The jack setup reportedly works as I use it
+with firefox, and mumble with no trouble. When
+I launch the following script, I see the vm
+connects to jack:
+
+/usr/bin/qemu-system-x86_64 -enable-kvm -M q35 -vga virtio -display gtk,gl=on \
+        -cpu host -smp 2,cores=2,threads=1 \
+        -m 4G -L /usr/share/qemu \
+        -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 \
+        -drive file=/usr/share/edk2-ovmf/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on \
+        -drive file=debian_VARS.fd,if=pflash,format=raw,unit=1 \
+        -audiodev id=jack,driver=jack -device ich9-intel-hda -device hda-duplex,audiodev=jack \
+        -device virtio-serial-pci \
+        -device virtserialport,chardev=spicechannel0,name=com.redhat.spice.0 \
+        -chardev spicevmc,id=spicechannel0,name=vdagent \
+        -device nec-usb-xhci,id=usb \
+        -device usb-host,vendorid=0x04ca,productid=0x708e \
+        -device usb-host,vendorid=0x1050,productid=0x0407 \
+        -chardev spicevmc,name=usbredir,id=usbredirchardev1 \
+        -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1 \
+        -chardev spicevmc,name=usbredir,id=usbredirchardev2 \
+        -device usb-redir,chardev=usbredirchardev2,id=usbredirdev2 \
+        -chardev spicevmc,name=usbredir,id=usbredirchardev3 \
+        -device usb-redir,chardev=usbredirchardev3,id=usbredirdev3 \
+        -netdev user,id=user.0 -device virtio-net-pci,netdev=user.0 \
+        -drive file=debian.qcow2,cache=none,aio=io_uring,if=virtio
+
+Output of vm initialization:
+
+jack: JACK output configured for 48000Hz (1024 samples)
+jack: JACK input configured for 48000Hz (1024 samples)
+gl_version 46 - core profile enabled
+GLSL feature level 430
+
+Though executing any application that uses sound,
+for instance, any youtube video through browser,
+I listen nothing. By executing pkill jackd, and
+launching the same script replacing the audiodev
+line for the following:
+
+        -audiodev id=alsa,driver=alsa -device ich9-intel-hda -device hda-duplex,audiodev=alsa \
+
+The audio works, and I can listen to music, or
+any other kind of application, though I cannot
+listen anything else in the host.
+
+The guest is a simple debian testing(bullseye)
+system with plasma desktop, using pulseaudio,
+nothing fancy.
+
+Thanks!
+
+José
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