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sdauth
Apprentice
Joined: 19 Sep 2018
Posts: 241
Location: Ásgarðr
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 Posted: Fri Jun 05, 2020 1:13 pm Post subject: qemu virglrenderer (virtio), black screen with X |
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Hello,
(I post this here as the end goal is to play some games  )
So I'm trying to use qemu and virglrenderer* instead of QXL. Unfortunately, all I get is a black screen upon login in the VM (the VM used is ubuntu, I tried also with Debian and Arch Linux VM, same results, also tried with different kernels in each VM)
Strangely, lightdm shows up but after I enter username,password -> black screen.
qemu-4.2.0-r6
virglrenderer-0.8.2
Here is the qemu command line :
| Code: | qemu-system-x86_64 -name ubuntu \
-enable-kvm \
-cpu host \
-smp cores=4,threads=1 \
-M q35 \
-m 8G \
-boot order=d \
-drive file=ubuntu.img,format=raw,aio=native,cache=none \
-machine type=pc,accel=kvm \
-vga virtio \
-display gtk,gl=on \
-soundhw hda |
here, display is set to gtk, but same issue if I use sdl
If I set it back to :
| Code: | -vga qxl \
-display gtk,gl=off \ |
then it works fine again.
*https://www.collabora.com/news-and-blog/blog/2019/08/28/virglrenderer-state-of-virtualized-virtual-worlds/
Some logs :
qemu output (started from terminal) :
| Code: | gl_version 43 - core profile enabled
vrend_renderer_fill_caps: Entering with stale GL error: 1280
GLSL feature level 430 |
(ubuntu vm via ssh) dmesg | grep drm :
| Code: | [ 9.148029] [drm] pci: virtio-vga detected at 0000:00:02.0
[ 9.151260] [drm] virgl 3d acceleration enabled
[ 9.151260] [drm] EDID support available.
[ 9.152296] [drm] number of scanouts: 1
[ 9.152304] [drm] number of cap sets: 2
[ 9.152491] [drm] cap set 0: id 1, max-version 1, max-size 308
[ 9.152551] [drm] cap set 1: id 2, max-version 2, max-size 688
[ 9.152797] [drm] Initialized virtio_gpu 0.1.0 0 for virtio0 on minor 0
[ 9.181299] virtio_gpu virtio0: fb0: virtio_gpudrmfb frame buffer device |
What is wrong ? Anyone using it with success ? |
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sdauth
Apprentice
Joined: 19 Sep 2018
Posts: 241
Location: Ásgarðr
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| Posted: Sat Jun 06, 2020 8:54 pm Post subject: |
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So, the only thing I hadn't tried was to test with a Gentoo VM, which I just did. And.. it works.
It doesn't explain why it fails with other distro though so I'll leave this thread open just in case someone knows. |
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x90e
n00b
Joined: 30 Sep 2020
Posts: 40
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| Posted: Thu Oct 01, 2020 11:13 pm Post subject: |
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| I had this issue when the desktop was rendering off screen, it just looked black after login but when I pressed win key+ d for the desktop or winkey+p in windows for the screen options It allowed me to select "always use screen 2" or "extend among this display" or "duplicate" and after I did that I was able to view the screen. It was like it had multiple monitors and I was viewing the wrong one. |
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