High CPU/GPU usage for video playback while display is off

mpv Information

mpv v0.41.0-356-gedc8534d0 Copyright © 2000-2026 mpv/MPlayer/mplayer2 projects
 built on Mar 21 2026 20:02:17
libplacebo version: v7.362.0 (v7.360.0-11-g33b5dfa-dirty)
FFmpeg version: N-123584-g9d97771bc
FFmpeg library versions:
   libavcodec      62.29.101
   libavdevice     62.4.100
   libavfilter     11.15.101
   libavformat     62.13.101
   libavutil       60.29.100
   libswresample   6.4.100
   libswscale      9.7.100

Other Information

- Windows version: 10.0.26200.8037
- GPU model, driver and version: Intel Core Ultra 9 275HX iGPU, driver v32.0.101.8626
- Source of mpv: https://github.com/zhongfly/mpv-winbuild/releases
- Latest known working version: -
- Issue started after the following happened: -

Reproduction Steps

1. mpv.com/mpv.exe higher_bitrate_video_file_or_stream
   • e.g. DOOM Gameplay Walkthrough FULL GAME [4K 60FPS PC ULTRA] - No Commentary
   • mpv.com --no-config --profile=fast --hwdec=auto https://youtu.be/IE5o6zHAKNU --gpu-debug --log-file=output.txt
2. turn off display (stand by mode), e.g.:
   • close lid of laptop (must be set to not go to sleep), or
   • AHK v2 script (assigned to Win + F7): #F7:: Sleep(500), SendMessage(0x112, 0xF170, 2, , "Program Manager")

Expected Behavior

Same or even lower CPU and GPU usage.

Actual Behavior

Increased CPU and GPU usage (1-2 logical cores), clearly audible fan noise, that will return to normal after the screen is turned back on.
The problem is present even is the playback window is minimized.

Log File

output-normal.zip

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested and confirmed that the issue exists with the latest release version or newer.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

Reproduce with mpv.com or mpv.exe using the provided --no-config --profile=fast --hwdec=auto command, then turn off the display without suspending the system. Start by inspecting output-normal.zip and the documented reproduction conditions. Done means identifying the cause of the increased CPU/GPU usage and confirming playback no longer shows elevated usage while the display is off.