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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1827790 Title: Dell XPS 13 9380 - Screen brightness flashes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1827790/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
