After more research (including getting different symptoms with kernel
6.8-rc3), this appears to be the amdgpu scatter/gather bug:
https://community.frame.work/t/responded-screen-flashing-partially-
white-on-framework-13-amd-ubuntu-22-04/40626/2
I've applied the `amdgpu.sg_display=0` kernel
Attached: a photograph of the displays after exiting display sleep but
before unlocking. If it's relevant, the affected display is attached to
the front right port of an AMD Framework laptop (USB 3.2 gen 2) using a
device recognised by lsusb as `Bus 001 Device 002: ID 0bda:5442 Realtek
This occurred after a fresh reboot this morning, after letting my
displays go to sleep for ~5 minutes. dmesg log also attached. The
IO_PAGE_FAULT entries begin shortly after moving my mouse to turn the
displays back on.
** Attachment added: "dmesg log after getting this issue."
Definitely not a KDE bug since this occurs in other desktops as well.
I'm guessing it has to do with the amdgpu driver?
** Package changed: kwin (Ubuntu) => linux (Ubuntu)
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