The corruption also happens in build
5.9.0-050900rc4drmintelnext20200915-generic but the error in dmesg does
not, and it's less, it only happens on window management actions (switch
window

Surprisingly with that, restarting gnome-shell actually fixes the issue
(it did not with normal kernel).

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https://bugs.launchpad.net/bugs/1896091

Title:
  [i915] graphic corruption following orkqueue: PF_MEMALLOC task
  131(kswapd0) is flushing !WQ_MEM_RECLAIM events_unbound:active_work
  [i915]

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