I tested the kernel from comment 34 and my computer is no longer crashing. With this kernel, it is possible to use default Xubuntu, without changing Xorg session or xfwm4 vblank_mode.
What I noticed is that there are 1330 dmesg errors like: [52999.965468] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=3180783 end=3180784) time 440 us, min 763, max 767, scanline start 748, end 769 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1868551 Title: Intel GPU Hangs : random screen freezing w/ Ubuntu 20.04 (Linux 5.4) i915_active_acquire To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1868551/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
