Transcoding not working on docker with QSV

[kaeru]

Hello, I am having troubles with transcoding.
I have an old QNAP NAS (TS451A) with an Intel Celeron N3060 CPU. This CPU should support Intel QSV. I use docker to run jellyfin and I imported the device for the GPU
Transcoding never worked great, but I noticed that I was using VAAPI, so I tried to switch to QVS but i get the error:

[AVHWDeviceContext @ 0x5592e061bdc0] libva: /usr/lib/jellyfin-ffmpeg/lib/dri/iHD_drv_video.so init failed
[AVHWDeviceContext @ 0x5592e061bdc0] Failed to initialise VAAPI connection: 1 (operation failed).
Device creation failed: -5.
Failed to set value 'vaapi=va: /dev/dri/renderD128,driver=iHD' for option 'init_hw_device': Input/output error
Error parsing global options: Input/output error

full ffmpeg log
  ffmpeg.txt (Size: 11.52 KB / Downloads: 34)

I don't really know what I'm doing wrong here.
Thank you in advance for your help