Sorry I just realized -- this may not be a kernel regression at all.
Mutter 40 was when atomic KMS started being used by GNOME. But it
doesn't work reliably for all kernel drivers. If that happens to include
vc4 then we just need to add it to Mutter's atomic_driver_deny_list.
As a workaround you can add this to /etc/environment:
MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu Impish)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: mutter (Ubuntu Impish)
Importance: Undecided => High
** Changed in: mutter (Ubuntu Impish)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1944397
Title:
HDMI does not display anything with Impish RPi desktop image
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