With mutter-3.28.0-1.fc28.x86_64 Dell XPS 15 9560, at least when connected to the docking station (but to which no additional monitors are connected): After logging into GNOME/Wayland, the screen freezes and /usr/bin/gnome-shell's main thread is busy waiting at > #0 0x00007f82f0dd6348 in meta_gpu_kms_wait_for_flip (gpu_kms=<optimized out>, error=error@entry=0x0) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/src/backends/native/meta-gpu-kms.c:297 > #1 0x00007f82f0ddb6bc in wait_for_pending_flips (onscreen=0x55d1e6839600) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/src/backends/native/meta-renderer-native.c:1677 > #2 0x00007f82f0ddb6bc in meta_onscreen_native_swap_buffers_with_damage (onscreen=0x55d1e6839600, rectangles=0x7ffede873350, n_rectangles=0) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/src/backends/native/meta-renderer-native.c:1861 > #3 0x00007f82ef805706 in cogl_onscreen_swap_buffers_with_damage (onscreen=onscreen@entry=0x55d1e6839600, rectangles=rectangles@entry=0x7ffede873350, n_rectangles=n_rectangles@entry=0) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/cogl/cogl/cogl-onscreen.c:319 > #4 0x00007f82f14ecfcf in swap_framebuffer (stage_window=0x55d1e6839600, swap_with_damage=0, swap_region=<synthetic pointer>, view=<optimized out>) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/cogl/clutter-stage-cogl.c:400 > #5 0x00007f82f14ecfcf in clutter_stage_cogl_redraw_view (stage_window=stage_window@entry=0x55d1e2dd9100, view=<optimized out>) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/cogl/clutter-stage-cogl.c:845 > #6 0x00007f82f14edc5b in clutter_stage_cogl_redraw (stage_window=0x55d1e2dd9100) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/cogl/clutter-stage-cogl.c:867 > #7 0x00007f82f155c6a9 in clutter_stage_do_redraw (stage=0x55d1e2dd8c00 [MetaStage]) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/clutter-stage.c:1121 > #8 0x00007f82f155c6a9 in _clutter_stage_do_update (stage=0x55d1e2dd8c00 [MetaStage]) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/clutter-stage.c:1236 > #9 0x00007f82f15478f9 in master_clock_update_stages (master_clock=0x7f82c0007480 [ClutterMasterClockDefault], stages=0x55d1e685d5a0 = {...}) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/clutter-master-clock-default.c:443 > #10 0x00007f82f15478f9 in clutter_clock_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/clutter/clutter/clutter-master-clock-default.c:567 > #11 0x00007f82f288d7dd in g_main_dispatch (context=0x55d1e2ade750) at /usr/src/debug/glib2-2.56.0-1.fc28.x86_64/glib/gmain.c:3177 > #12 0x00007f82f288d7dd in g_main_context_dispatch (context=context@entry=0x55d1e2ade750) at /usr/src/debug/glib2-2.56.0-1.fc28.x86_64/glib/gmain.c:3830 > #13 0x00007f82f288dba8 in g_main_context_iterate (context=0x55d1e2ade750, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /usr/src/debug/glib2-2.56.0-1.fc28.x86_64/glib/gmain.c:3903 > #14 0x00007f82f288ded2 in g_main_loop_run (loop=0x55d1e2e06380) at /usr/src/debug/glib2-2.56.0-1.fc28.x86_64/glib/gmain.c:4099 > #15 0x00007f82f0d74a80 in meta_run () at /usr/src/debug/mutter-3.28.0-1.fc28.x86_64/src/core/main.c:660 > #16 0x000055d1e0f5b4d8 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/gnome-shell-3.28.0-1.fc28.x86_64/src/main.c:525 never falling out of the while (onscreen_native->total_pending_flips) loop because meta_gpu_kms_wait_for_flip keeps returning early with FALSE because gpu_kms->page_flips_not_supported. (The laptop doesn't work well without the docking station, and didn't work well with F27, either, with sporadic hangs, sporadic refusal to suspend, etc., but the scenario above is reproducible now.)
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