Bug 490688 - GPU decoding usage rises dramatically once I've logged out or switched between SDR/HDR mode.
Summary: GPU decoding usage rises dramatically once I've logged out or switched betwee...
Status: REPORTED
Alias: None
Product: kwin
Classification: Plasma
Component: performance (show other bugs)
Version: 6.1.3
Platform: Arch Linux Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2024-07-23 05:27 UTC by laichiaheng
Modified: 2024-07-26 23:02 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description laichiaheng 2024-07-23 05:27:47 UTC 
***
If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***

SUMMARY


STEPS TO REPRODUCE
1. Log out and then log in.
2. Play videos and drag the window through the desktop.
3. 

OBSERVED RESULT
Animation stutter.

EXPECTED RESULT
Works like before.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Arch Linux.
(available in About System)
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
Comment 1 laichiaheng 2024-07-23 05:28:28 UTC 
There are 3 ways to trigger it.

    Log out and then log in.

    Switching between HDR and SDR mode.

    Turn off the monitor and turn it on again.

Trying display: wayland
vainfo: VA-API version: 1.21 (libva 2.22.0)
vainfo: Driver version: Mesa Gallium driver 24.1.4-arch1.2 for AMD Radeon RX 6750 XT (radeonsi, navi22, LLVM 18.1.8, DRM 3.57, 6.
9.10-zen1-1-zen)
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple            : VAEntrypointVLD
VAProfileMPEG2Main              : VAEntrypointVLD
VAProfileVC1Simple              : VAEntrypointVLD
VAProfileVC1Main                : VAEntrypointVLD
VAProfileVC1Advanced            : VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main               : VAEntrypointVLD
VAProfileH264Main               : VAEntrypointEncSlice
VAProfileH264High               : VAEntrypointVLD
VAProfileH264High               : VAEntrypointEncSlice
VAProfileHEVCMain               : VAEntrypointVLD
VAProfileHEVCMain               : VAEntrypointEncSlice
VAProfileHEVCMain10             : VAEntrypointVLD
VAProfileHEVCMain10             : VAEntrypointEncSlice
VAProfileJPEGBaseline           : VAEntrypointVLD
VAProfileVP9Profile0            : VAEntrypointVLD
VAProfileVP9Profile2            : VAEntrypointVLD
VAProfileAV1Profile0            : VAEntrypointVLD
VAProfileNone                   : VAEntrypointVideoProc

You can test it by playing 4K videos and drag the window around the desktop, it is easily to see the stutter in window animation and high decoding usage in AMDGPU_TOP, or you can install Smarter Video Wallpaper Reborn, the animation will be laggy if you right click on the desktop.