I’ve been using my LG OLED55BX TV as a second monitor for several months now, without issues. But at some point I realised that only two HDMI ports on the TV support HDMI 2.1, so since I’m trying to get 10bit colour working I switched my cable. Unfortunately I also upgraded my drivers around about the same time, to 390.143. Sadly can’t tell which did it, but since then (last three months) if I boot with my OLED55BX off, then turn it on later, the driver crashes (NULL ptr.) At first I thought, upgrade my kernel & drivers, then see what’s up. I’ve done that now, and with 460.67 drivers and a 5.12.4 kernel, this hard crash still happens reproducibly, with my HDMI cable in either 2.1 compatible port.
As I say, can’t tell if it was the move to the HDMI 2.1 port or the upgrade to >=390 drivers that did it, but my gut tells me it’s HDMI 2.1 related.
Attached find dmesg output with the crash callstack somewhere in nvidia_modeset, an nvidia-bug-report form before the crash, and another nvidia-bug-report run from after the crash, Xorg.log, xorg.conf, and config.gz.
PS if anyone knows anything about how to get 10bit colour on linux with xorg, please let me know, been trying to get that working for ages!