vainfo output:
libva info: VA-API version 1.12.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_12
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.12 (libva 2.12.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 21.3.1 (30944ce)
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
VAProfileHEVCMain : VAEntrypointVLD
VAProfileHEVCMain : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointFEI

session log:
NXAGENT - Version 7.6.2

Copyright (C) 2001, 2021 NoMachine.
See http://www.nomachine.com/ for more information.

Session: Starting session at Mon Oct 11 11:22:35 2021.
Info: Agent running with pid 1456.
Info: Slave server running with pid 1467.
Info: Listening to slave connections on port 12001.
Info: Display running with pid 1468.
Info: Audio server started with pid 1476.
Info: Display server started with pid 1481.
Info: Audio client started with pid 1480.
"The XKEYBOARD keymap compiler (nxkb) reports:"
"> "Warning: Unsupported high keycode 372 for name <I372> ignored
"> " X11 cannot support keycodes above 255.
"> " This warning only shows for the first high keycode.
"Errors from nxkb are not fatal to the X server"
Session: Session started at Mon Oct 11 11:22:35 2021.
"The XKEYBOARD keymap compiler (nxkb) reports:"
"> "Warning: Unsupported high keycode 372 for name <I372> ignored
"> " X11 cannot support keycodes above 255.
"> " This warning only shows for the first high keycode.
"Errors from nxkb are not fatal to the X server"
Info: Using MIT-SHM extension.
Info: Using SSE3 for screen analysis.
Session: Connected to display server ':0' at 'Mon Oct 11 11:22:41 2021'.
Session: Connected to events server ':0' at 'Mon Oct 11 11:22:41 2021'.
Info: Screen capture running with pid 1707.
Info: Using damage extension for screen updates.
Info: Screen analysis running with pid 1709.
Info: Using screen size 1920x1080.
Info: Using grab method 'CopyArea'.
Info: Display server for 0BAB1992D0FD5D81EAAA7A9D3F237EE5 connected on Mon Oct 11 11:22:42 2021.
Info: Audio server for 0BAB1992D0FD5D81EAAA7A9D3F237EE5 connected on Mon Oct 11 11:22:42 2021.
Info: Audio client for 0BAB1992D0FD5D81EAAA7A9D3F237EE5 connected on Mon Oct 11 11:22:42 2021.
Info: Using H.264 software encoder.
Info: RT handler running with pid 1764.
Info: Audio reader running with pid 1785.