Background processes use VRAM after recent update

Help
1

After a recent update (not sure which exactly, I’m using Manjaro testing, so I am on Plasma 6.2.4, Qt 6.8.1 now), a lot of background processes started using 10 MB of VRAM.

Specifically I noticed this issue through nvtop which reports the following usage that didn’t happen before:

    PID  USER DEV     TYPE  GPU        GPU MEM    CPU  HOST MEM Command
   1749 mysak   1  Compute   0%     10MiB   2%     0%    106MiB /usr/bin/kded6
   1827 mysak   1  Compute   0%     10MiB   2%     0%     66MiB /usr/lib/kactivitymanagerd
   1832 mysak   1  Compute   0%     10MiB   2%     0%     78MiB /usr/lib/org_kde_powerdevil
   1833 mysak   1  Compute   0%     10MiB   2%     0%     77MiB /usr/lib/xdg-desktop-portal-kde
   2023 mysak   1  Compute   0%     10MiB   2%     0%     77MiB /usr/bin/kwalletd6
   2098 mysak   1  Compute   0%     10MiB   2%     0%     89MiB /usr/bin/kdeconnectd
   2106 mysak   1  Compute   0%     10MiB   2%     1%    188MiB /usr/bin/yakuake
   1747 mysak   1  Compute   0%     10MiB   2%     0%     66MiB /usr/bin/ksmserver
   1829 mysak   1  Compute   0%     10MiB   2%     0%     44MiB /usr/bin/gmenudbusmenuproxy
   1830 mysak   1  Compute   0%     10MiB   2%     0%     67MiB /usr/bin/kaccess
   1834 mysak   1  Compute   0%     10MiB   2%     0%     44MiB /usr/bin/xembedsniproxy

Each individual 10 MB of VRAM used wouldn’t be problematic, but there are at least 11 such processes there after fresh boot (more if I play around during the session), which eats up over 20% of my integrated GPU’s VRAM!
This actually means that even normal things such as video playback overflow the VRAM into GTT, causing noticeable stutters at times.

Any hints on how I could resolve this or at least how to go about triaging/bisecting the issue better?
My distro being arch-based means, that I can’t really go cherry-picking specific Qt versions to test, as doing so would almost surely make the whole desktop crash.

Thanks in advance!

2

Some apps use (gpu) hardware acceleration for better performance, smoother animations etc… I wouldn’t worry about those, the system probably knows when to free up that memory for other processes. The wayland compositor is responsible for the hardware acceleration but I’m not sure how you could disable that, you could use X11 instead and disable the compositor globally or individually for each app I guess.