Compositor in X11 mode runs fine, but not in DRM mode.

[Mad Fish The One]

In X11 mode, compositor and clients (I've tested terminal and flower)
work just fine. When I'm running compositor in DRM mode, it runs (I
can see background image and cursor), but any client fails with
message: "sent request to invalid object". I'm running compositor and
clients as root.

Backtrace for "flower" client:

#0  0xb7fe1424 in __kernel_vsyscall ()
#1  0xb78ffde1 in raise () from /lib/libc.so.6
#2  0xb790166e in abort () from /lib/libc.so.6
#3  0xb7fdbd71 in display_handle_invalid_object (data=0x0,
display=0x8056500, id=0) at wayland-client.c:249
#4  0xb7fbb2cf in ffi_call_SYSV () from /usr/lib/libffi.so.5
#5  0xb7fbb10e in ffi_call () from /usr/lib/libffi.so.5
#6  0xb7fdd1c1 in wl_closure_invoke (closure=0x805a5b8,
target=0x8056500, func=0xb7fdbd30 <display_handle_invalid_object>,
    data=0x0) at connection.c:659
#7  0xb7fdc578 in handle_event (display=0x8056500, mask=1) at
wayland-client.c:475
#8  wl_display_iterate (display=0x8056500, mask=1) at wayland-client.c:500
#9  0x0804cb12 in display_create (argc=0xbffffa80, argv=0xbffffa84,
option_entries=0x0) at window.c:1218
#10 0x0804a9e9 in main (argc=1, argv=0xbffffb24) at flower.c:126