[Bug]: Dropped frames and 100 % usage of engine Render/3D playing vp9 3840x2160 60.000fps (Dell XPS 13 9360)

### Which component impacted?

_No response_

### Is it regression? Good in old configuration?

None

### What happened?

Debian sid/unstable with *intel-media-va-driver-non-free* 24.1.0+ds1-1 and *libigdgmm12* 22.3.17+ds1-1

The Dell XPS 13 9360 comes with a HiDPI screen, but playing such a video with VA-API in mpv, frames are dropped – also on a external HiDPI Dell monitor connected over DisplayPort of a Dell DA300 USB-C adapter:

```
$ yt-dlp -F https://www.youtube.com/watch?v=aqz-KE-bpKQ
[youtube] Extracting URL: https://www.youtube.com/watch?v=aqz-KE-bpKQ
[youtube] aqz-KE-bpKQ: Downloading webpage
[youtube] aqz-KE-bpKQ: Downloading ios player API JSON
[youtube] aqz-KE-bpKQ: Downloading android player API JSON
[youtube] aqz-KE-bpKQ: Downloading player 5683fc5e
[youtube] aqz-KE-bpKQ: Downloading m3u8 information
[info] Available formats for aqz-KE-bpKQ:
ID EXT RESOLUTION FPS CH │ FILESIZE TBR PROTO │ VCODEC VBR ACODEC ABR ASR MORE INFO
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
[…]
315 webm 3840x2160 60 │ 1.42GiB 19258k https │ vp09.00.51.08 19258k video only 2160p60, webm_dash
$ yt-dlp -f 315 https://www.youtube.com/watch?v=aqz-KE-bpKQ
[youtube] Extracting URL: https://www.youtube.com/watch?v=aqz-KE-bpKQ
[youtube] aqz-KE-bpKQ: Downloading webpage
[youtube] aqz-KE-bpKQ: Downloading ios player API JSON
[youtube] aqz-KE-bpKQ: Downloading android player API JSON
[youtube] aqz-KE-bpKQ: Downloading m3u8 information
[info] aqz-KE-bpKQ: Downloading 1 format(s): 315
[download] Destination: Big Buck Bunny 60fps 4K - Official Blender Foundation Short Film [aqz-KE-bpKQ].webm
[download] 100% of 1.42GiB in 00:00:31 at 46.40MiB/s
$ mpv Big\ Buck\ Bunny\ 60fps\ 4K\ -\ Official\ Blender\ Foundation\ Short\ Film\ \[aqz-KE-bpKQ\].webm
(+) Video --vid=1 (*) (vp9 3840x2160 60.000fps)
Using hardware decoding (vaapi).
VO: [gpu] 3840x2160 vaapi[nv12]
(Paused) V: 00:00:23 / 00:10:34 (4%) Dropped: 779
```

### What's the usage scenario when you are seeing the problem?

Playback

### What impacted?

_No response_

### Debug Information

```
$ sudo dmesg | grep -e "DMI:" -e "Linux version" -e microcode
[ 0.000000] Linux version 6.8.0-rc4+ (build@bohemianrhapsody.molgen.mpg.de) (gcc (Debian 13.2.0-13) 13.2.0, GNU ld (GNU Binutils for Debian) 2.42) #25 SMP PREEMPT_DYNAMIC Sat Feb 17 05:39:03 CET 2024
[ 0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022
[ 0.367292] microcode: Current revision: 0x000000f4
[ 0.367293] microcode: Updated early from: 0x000000f0
$ lspci -nn -s 02.0
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 620 [8086:5916] (rev 02)
02:02.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015] [8086:1576]
$ vainfo
libva info: VA-API version 1.20.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_20
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.20 (libva 2.12.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 24.1.0 ()
vainfo: Supported profile and entrypoints
VAProfileNone : VAEntrypointVideoProc
VAProfileNone : VAEntrypointStats
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Simple : VAEntrypointEncSlice
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointFEI
VAProfileH264Main : VAEntrypointEncSliceLP
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointFEI
VAProfileH264High : VAEntrypointEncSliceLP
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileJPEGBaseline : VAEntrypointEncPicture
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264ConstrainedBaseline: VAEntrypointFEI
VAProfileH264ConstrainedBaseline: VAEntrypointEncSliceLP
VAProfileVP8Version0_3 : VAEntrypointVLD
VAProfileVP8Version0_3 : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointVLD
VAProfileHEVCMain : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointFEI
VAProfileHEVCMain10 : VAEntrypointVLD
VAProfileHEVCMain10 : VAEntrypointEncSlice
VAProfileVP9Profile0 : VAEntrypointVLD
VAProfileVP9Profile2 : VAEntrypointVLD
$ mpv --version
mpv 0.37.0 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
libplacebo version: v6.338.2
FFmpeg version: 6.1.1-1
FFmpeg library versions:
libavutil 58.29.100
libavcodec 60.31.102
libavformat 60.16.100
libswscale 7.5.100
libavfilter 9.12.100
libswresample 4.12.100

```

### Do you want to contribute a patch to fix the issue?

No.