@John try to install Linux Kernel 5.5.13 (aka 5.5.0-1) from sid
https://packages.debian.org/sid/kernel/linux-image-5.5.0-1-amd64-unsigned https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5.12/CHANGES Chris Wilson (1): drm/i915/execlists: Track active elements during dequeue Matt Roper (1): drm/i915: Handle all MCR ranges Caz Yokoyama (1): Revert "drm/i915/tgl: Add extra hdc flush workaround" Check the comment on Debian Bug #954817 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954817#17 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1868551/comments/29
