Intel simply has no closed source driver for Linux. New hardware is often supported/merged before it is even sold. AMD is trying the same, but not there yet.
Typically the entire system will freeze (speakers will continue to play whatever was in the short audio buffer - pretty awful) for 10-15s, then the driver will detect the hang and reboot the iGPU. Happens much more frequently (every ~15m) when using more graphically intense programs. I can't use blender because sometimes when it hangs it won't reset and requires a full reboot.
There are dozens of issues about it and related problems in Intel's drm fork of the kernel [0]. I (finally) posted a bug report about it months ago since it seemed to have gotten worse after 5.4 but never heard back from them.
All this to say - be wary of Intel graphics on linux.
In general, it's kind of a crapshoot no matter which way you go, and expect pain if the gpu chipset is less than a year old.