Following advice I saw on Stackexchange, I've been setting
`intel_iommu=igfx_off` on the kernel command line; this seems to
mitigate, but the bug still occurs.

I've submitted a redacted version of the apport-collect output, which I
hope is enough. I will tentatively mark the bug confirmed.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1815508

Title:
  Xorg freezes due to kernel hung task in the i915 driver

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