Comment 0 for bug 1931890

When I check hardware acceleration in vlc for intel graphics drivers using intel-gpu-tools, it seems like vlc has a problem with the 3d render engine in the vaapi module.
I use Ubuntu MATE 20.04 with Compiz as a window manager (used plugins Scale, Expo, Desktop Wall, etc.). When I work with several virtual desktops, the load on the 3D rendering engine of the Intel driver drops when I switch to a different desktop than the one on which vlc is active.
In the Scale plug-in (overview of all windows on all workspaces) the graphics output then stutters in the reduced video image from vlc. In a normal HD video (1280x720) the load drops from approx. 32% to approx. 8%. The video engine (hardware acceleration) has no errors.
Occupancy continuously at 4% to 6%.

Vlc works perfectly under Nvidia graphics (no stuttering graphic image in the reduced vlc video window with an overview of all windows on all workspaces).

Gstreamer (Ver. 1.18) works fine with gst-play-1.0 on vaapi and nvidia-vdpau. There is no drop in the utilization of the 3D rendering engine with an overview of all windows on all workspaces in the Scale plug-in. (Checked with intel_gpu_top at Intelgraphics).
The graphics output runs without stuttering in the reduced vlc window and the Utilization in 3D Render Engine is continuously around 33% throughout.

This issue exist already a long time before up to now and in other distros and flavors with Compiz.

My machine:

tux@tux-Aspire-V5-573G:~$ neofetch
            .-/+oossssoo+/-. tux@tux-Aspire-V5-573G
        `:+ssssssssssssssssss+:` ----------------------
      -+ssssssssssssssssssyyssss+- OS: Ubuntu 20.04.2 LTS x86_64
    .ossssssssssssssssssdMMMNysssso. Host: Aspire V5-573G TBD by
   /ssssssssssshdmmNNmmyNMMMMhssssss/ Kernel: 5.4.0-74-generic
  +ssssssssshmydMMMMMMMNddddyssssssss+ Uptime: 2 hours, 10 mins
 /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/ Packages: 2927 (dpkg), 12 (snap)
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Shell: bash 5.1.8
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Resolution: 1920x1080
ossyNMMMNyMMhsssssssssssssshmmmhssssssso DE: MATE
ossyNMMMNyMMhsssssssssssssshmmmhssssssso WM: Compiz
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ WM Theme: Radiant-MATE
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Theme: Mojave-light [GTK2/3]
 /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/ Icons: Radiant-MATE [GTK2/3]
  +sssssssssdmydMMMMMMMMddddyssssssss+ Terminal: mate-terminal
   /ssssssssssshdmNNNNmyNMMMMhssssss/ Terminal Font: Ubuntu Mono 13
    .ossssssssssssssssssdMMMNysssso. CPU: Intel i5-4200U (4) @ 2.600GHz
      -+sssssssssssssssssyyyssss+- GPU: NVIDIA GeForce GT 750M
        `:+ssssssssssssssssss+:` GPU: Intel Haswell-ULT
            .-/+oossssoo+/-. Memory: 2222MiB / 7845MiB