Threre seem to be issues in 5.10.4+ - somehow related to audio via hdmi maybe, usually results in random gfx glitches and gpu hangs/system freezes. snd_hda_codec_hdmi errors or gpu hang messages (in log / dmesg) might confirm this.
Rolling back to Kernel <= 5.10.3 or blacklisting snd_hda_codec_hdmi might help mitigating.

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Disabling silent streams for snd_hda actually also seem to do the trick and keeps hdmi audio working:
Inject the following to modprobe:
options snd_hda_codec_hdmi enable_silent_stream=N

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chaos.social

chaos.social – a Fediverse instance for & by the Chaos community