Doing a quick research yields the following:
- https://gitlab.freedesktop.org/drm/intel/-/issues/3043
- GPU HANG: ecode 9:1:85dffffb while using PCSX2, Minecraft and probably MANY other OpenGL applications (#4858) · Issues · drm / intel · GitLab
- GPU hang ecode 9:1:85dffffb on Optimus laptop / Laptop Issues / Arch Linux Forums
- [SOLVED] Xorg freezes seemingly randomly / Newbie Corner / Arch Linux Forums
The second link (4858) appears to be the main one which includes a potential fix