Black Screen with Spice and OpenGL acceleration in virt-manager with QEMU/KVM

[Filip Banák]

Hi, thanks in advance.

Only way I got it to work is with qemu on the command line like this:

qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2 -m
8192 -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1
-display egl-headless,gl=on -usb -device usb-tablet -bios
/usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device virtio-vga,virgl=on
-spice disable-ticketing,image-compression=off,seamless-
migration=on,unix,addr=/run/user/1000/spice.sock

remote-viewer --verbose --debug --spice-debug spice+unix:///run/user/1000/
spice.sock


I have checked the logs, and yes there were errors they are linked in the
Manjaro forum thread, but here you go:

https://pastebin.com/pehWEQ0L

These are the errors at the bottom:
qemu-system-x86_64: warning: Spice: dcc.c:664:dcc_push_monitors_config:
monitors_config is NULL
gl_version 33 - core profile enabled
qemu_spice_gl_scanout_texture: failed to get fd for texture

But like I said the VM works even like that but I can use it only blindly
through the keyboard, because the screen is just black.


Dňa st 6. 5. 2020, 20:14 Cole Robinson <crobinso at redhat.com> napísal(a):

> On 5/1/20 7:28 AM, Filip Banák wrote:
> > Hello.
> >
> > I just want to use an Arch Linux guest with OpenGL 3D acceleration on
> > with Spice.
> > It works with Spice when the OpenGL acceleration is disabled.
> > But when I enable it (with vitio graphics with accel3d yes of course), I
> > only see a black screen, but when the VM boots I can interact with it
> > through the keyboard blindly.
> > Please see my forum thread here for more:
> >
> https://forum.manjaro.org/t/qemu-kvm-vm-in-virt-manager-is-running-with-a-black-screen-when-opengl-acceleration-is-turned-on/138632
> >
> > I also tested all this:
> >
> > Working with no acceleration with Spice without gl=on in -display:
> > qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
> > -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1
> > -display spice-app -usb -device usb-tablet -bios
> > /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> virtio-vga,virgl=on
> >
> >
> > Not working with Spice with gl=on in -display, remote-viewer closes
> > instantly:
> > qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
> > -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1
> > -display spice-app,gl=on -usb -device usb-tablet -bios
> > /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> virtio-vga,virgl=on
> >
> >     Error: qemu-system-x86_64: warning: Spice:
> > dcc.c:664:dcc_push_monitors_config: monitors_config is NULL
> >
> >
> > Probably Working with acceleration(just no graphical output) without
> > Spice with -display gtk,gl=on
> > qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
> > -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1
> > -display gtk,gl=on -usb -device usb-tablet -bios
> > /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> virtio-vga,virgl=on
> >
> >     No error just black screen.
> >
> >
> > Working with acceleration without Spice, just QEMU SDL:
> > qemu-system-x86_64 -drive file=/home/filip/VM/archlinux.qcow2 -m 8192
> > -enable-kvm -M q35 -cpu host -smp 12,sockets=1,cores=12,threads=1
> > -display sdl,gl=on -usb -device usb-tablet -bios
> > /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> virtio-vga,virgl=on
> >
> >
> > Working with with Spice with acceleration with EGL-HEADLESS, gl=on in
> > -display does not matter here, it is automatic/implied:
> > qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2
> > -m 8192 -enable-kvm -M q35 -cpu host -smp
> > 12,sockets=1,cores=12,threads=1 -display egl-headless,gl=on -usb -device
> > usb-tablet -bios /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> > virtio-vga,virgl=on -spice
> >
> disable-ticketing,image-compression=off,seamless-migration=on,unix,addr=/run/user/1000/spice.sock
> >
> > remote-viewer --verbose --debug --spice-debug
> > spice+unix:///run/user/1000/spice.sock
> >
> >
> > Working SDL with acceleration, also can connect with Spice but see black
> > screen but can use keyboard and mouse and see output on qemu sdl window:
> > qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2
> > -m 8192 -enable-kvm -M q35 -cpu host -smp
> > 12,sockets=1,cores=12,threads=1 -usb -device usb-tablet -bios
> > /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> > virtio-vga,virgl=on -spice
> >
> unix,addr=/run/user/1000/spice.sock,disable-ticketing,image-compression=off,seamless-migration=on
> > -display sdl,gl=on
> >
> >
> > Not working Remote Viewer opens but no output just "Connected to graphic
> > server" in the middle of the window.
> > qemu-system-x86_64 -name Arch -drive file=/home/filip/VM/archlinux.qcow2
> > -m 8192 -enable-kvm -M q35 -cpu host -smp
> > 12,sockets=1,cores=12,threads=1 -usb -device usb-tablet -bios
> > /usr/share/ovmf/x64/OVMF_CODE.fd -boot order=c -device
> > virtio-vga,virgl=on -spice
> >
> gl=on,unix,addr=/run/user/1000/spice.sock,disable-ticketing,image-compression=off,seamless-migration=on
> >
> > remote-viewer --verbose --debug --spice-debug
> > spice+unix:///run/user/1000/spice.sock
> >
> > I guess the problem when trying with virt-manager is the same as when
> > trying with -display spice-app,gl=on.
> >
> > Running on Manjaro linux with Nvidia GT630 graphics and Qemu version 4.2.
> > Any help is appreciated.
> > Thank you.
>
> I may not have followed all the details, but have you gotten it working
> with any setup via libvirt, or only with qemu on the command line? It
> could be libvirt is not granting access to all the needed host resources
> correctly, like the drm node path. Check
> /var/log/libvirt/qemu/$vmname.log and see if qemu prints and errors
>
> - Cole
>
>
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