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I have had imperfect behaviour from Plymouth as long as I've had the card - i.e. across several years of Ubuntu versions. Card is connected via Onkyo SR707 receiver to HDTV, using open-source drivers. Two main items:

No splash

Graphical splash screen is not shown, TV shows "Mode Not Supported" until desktop login loads. GRUB is in a reasonable resolution (vbeinfo says 800x600x32), aubergine blank screen shows momentarily after selected Ubuntu from the menu. This goes black instead of showing the splash. Plymouth debug logs show a variety of failures, most look like attempts to probe devices to me. The relevant section appears to be the most successful attempt, on /dev/fb0:

[ply-device-manager.c:284]                    create_seats_for_subsystem:creating seats for frame buffer devices
[ply-device-manager.c:303]                    create_seats_for_subsystem:found device /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/graphi
cs/fb0
[ply-device-manager.c:311]                    create_seats_for_subsystem:device is initialized
[ply-device-manager.c:322]                    create_seats_for_subsystem:found node /dev/fb0
[ply-device-manager.c:178]                   create_seat_for_udev_device:device is for local console: yes
[ply-device-manager.c:191]                   create_seat_for_udev_device:device subsystem is graphics
[ply-device-manager.c:200]                   create_seat_for_udev_device:found frame buffer device /dev/fb0
[ply-device-manager.c:135]                      fb_device_has_drm_device:trying to find associated drm node for fb device (path: (null))
[ply-device-manager.c:161]                      fb_device_has_drm_device:no card entry!
[ply-device-manager.c:641]    create_seat_for_terminal_and_renderer_type:creating seat for /dev/fb0 (renderer type: 2) (terminal: /dev/tty7)
[ply-renderer.c:234]                      ply_renderer_open_plugin:trying to open renderer plugin /lib/x86_64-linux-gnu/plymouth/renderers/fra
me-buffer.so
[./plugin.c:259]                                create_backend:creating renderer backend for device /dev/fb0
[ply-terminal.c:615]                             ply_terminal_open:terminal /dev/tty7 is already open
[./plugin.c:515]                                  query_device:32 bpp (8, 8, 8, 0) with rowstride 5120
[./plugin.c:275]                               initialize_head:initializing 1280x720 head
[ply-renderer.c:256]                      ply_renderer_open_plugin:opened renderer plugin /lib/x86_64-linux-gnu/plymouth/renderers/frame-buffe
r.so
[ply-seat.c:80]                            add_pixel_displays:Adding displays for 1 heads
[ply-seat.c:116]                             add_text_displays:adding text display for terminal /dev/tty7
[main.c:1051]                                 on_seat_added:listening for keystrokes
[main.c:1055]                                 on_seat_added:listening for escape
[main.c:1059]                                 on_seat_added:listening for backspace
[main.c:1063]                                 on_seat_added:listening for enter
[ply-device-manager.c:303]                    create_seats_for_subsystem:found device /sys/devices/virtual/graphics/fbcon
[ply-device-manager.c:334]                    create_seats_for_subsystem:it's not initialized
[main.c:2367]                                          main:entering event loop

So apparently there is no card entry for the FB device and/or it's not initialized. Eventually I see:

[main.c:266]                                 show_messages:not displaying messages, since no boot splash

Code here says splash is null, probably due to the earlier failure.

1280x720 is also my desktop resolution and definitely supported, so this seems okay. Splash shows correctly at shutdown.

EDIT

Using FB at all is fall-back behaviour according to the documentation. An earlier attempt fails like this:

[ply-device-manager.c:303]                    create_seats_for_subsystem:found device /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/ca
rd0
[ply-device-manager.c:311]                    create_seats_for_subsystem:device is initialized
[ply-device-manager.c:322]                    create_seats_for_subsystem:found node /dev/dri/card0
[ply-device-manager.c:178]                   create_seat_for_udev_device:device is for local console: yes
[ply-device-manager.c:191]                   create_seat_for_udev_device:device subsystem is drm
[ply-device-manager.c:195]                   create_seat_for_udev_device:found DRM device /dev/dri/card0
[ply-device-manager.c:641]    create_seat_for_terminal_and_renderer_type:creating seat for /dev/dri/card0 (renderer type: 1) (terminal: /dev/t
ty7)
[ply-renderer.c:234]                      ply_renderer_open_plugin:trying to open renderer plugin /lib/x86_64-linux-gnu/plymouth/renderers/drm
.so
[./plugin.c:379]                                create_backend:creating renderer backend for device /dev/dri/card0
[./plugin.c:464]                                   load_driver:Opening '/dev/dri/card0'
[ply-terminal.c:619]                             ply_terminal_open:trying to open terminal '/dev/tty7'
[ply-terminal.c:409]                 ply_terminal_look_up_geometry:looking up terminal text geometry
[ply-terminal.c:424]                 ply_terminal_look_up_geometry:terminal is now 160x45 text cells
[ply-terminal.c:462]                                 get_active_vt:Remembering that initial vt is 7
[./plugin.c:860]                                  query_device:Could not initialize heads
[ply-renderer.c:250]                      ply_renderer_open_plugin:could not query rendering device for plugin /lib/x86_64-linux-gnu/plymouth/
renderers/drm.so
[./plugin.c:552]                                  close_device:closing device
[./plugin.c:501]                                 unload_driver:unloading driver
[ply-renderer.c:288]                             ply_renderer_open:could not find suitable rendering plugin
[ply-seat.c:135]                                 ply_seat_open:could not open renderer for /dev/dri/card0
[ply-device-manager.c:646]    create_seat_for_terminal_and_renderer_type:could not create seat
[ply-seat.c:326]                           free_pixel_displays:freeing 0 pixel displays
[ply-seat.c:348]                            free_text_displays:freeing 0 text displays

As far as I'm aware the HD 4000 series has mature DRM/DRI support. glxinfo reports direct rendering: Yes.

Resolution/overscan issue for text

If fsck kicks in or there is some error, text is not aligned with the screen. There are large overlaps on at least left, top and bottom making it almost unusable. Ctrl-Alt-F1 after boot displays the console correctly.

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