Seems that a fix is backported to kernel 5.4.0-16.19 for Focal:
* system hang: i915 Resetting rcs0 for hang on rcs0 (LP: #1861395)
- drm/i915/execlists: Always force a context reload when rewinding RING_TAIL
https://launchpad.net/ubuntu/+source/linux/5.4.0-16.19
Has anyone tried that kernel?
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https://bugs.launchpad.net/bugs/1872001
Title:
5.3.0-46-generic - i915 - frequent GPU hangs / resets rcs0
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