Comment 12 for bug 1827790

Hello all, I believe that I have this same bug, also after a 19.04 fresh install. I initially posted on that bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1826125 but they kindly directed me here.

Of note, I am glad you tried wayland as I wanted to try if that made any difference. I have tried passing different kernel parameters (though not all combinations) namely:

First try: i915.edp_vswing=2
Second try: i915.fastboot=1 i915.edp_vswing=1 i915.preliminary_hw_support=1 intel_idle.max_cstate=1 acpi_backlight=vendor acpi.osi=Linux (see https://www.reddit.com/r/linuxquestions/comments/ayi4n6/flickering_on_laptops_with_a_4k_screen_and_intel/) but that did not seem to make any difference apart from disabling the backlight controls

It somewhat feels good to have that identified as a bug.