diff --git a/py/tests/big_fb.py b/py/tests/big_fb.py
--- /dev/null
+++ b/py/tests/big_fb.py
@@ -0,0 +1,279 @@
+#!/usr/bin/python3
+
+import pykms
+import random
+import time
+import sys
+import select
+import argparse
+import selectors
+
+black = pykms.RGB(0, 0, 0)
+
+parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
+parser.add_argument('--flipmode', choices=['single', 'separate'], default='single', required=False,
+ help="""Page flip method to use:
+ single: Page flip on all displays with one request (default)
+ separate: Separate page flip on the displays""")
+
+args = parser.parse_args()
+
+card = pykms.Card()
+
+if not card.has_atomic:
+ print('Atomic mode settings is not supported :(')
+ sys.exit()
+
+if args.flipmode == 'single':
+ print('Page flip on all displays with one request')
+elif args.flipmode == 'separate':
+ print('Page flip on all displays with separate requests')
+
+res = pykms.ResourceManager(card)
+
+conn_list = []
+crtc_list = []
+mode_list = []
+plane_list = []
+big_fb_list = []
+
+for conn in card.connectors:
+ if conn.connected() == 1:
+ conn_list.append(conn)
+
+print('Have {} connected connectors:'.format(len(conn_list)))
+for conn in conn_list:
+ crtc = res.reserve_crtc(conn)
+ crtc_list.append(crtc)
+
+ mode = conn.get_default_mode()
+ mode_list.append(mode)
+
+ print(' {}: {} ({}x{})'.format(conn.idx, conn.fullname,
+ mode.hdisplay, mode.vdisplay))
+
+fbX = sum(mode.hdisplay for mode in mode_list)
+fbY = max(mode.vdisplay for mode in mode_list)
+
+print('FB Resolution: {}x{}\n'.format(fbX, fbY))
+
+# Create the (big)framebuffer(s)
+for x in range(2):
+ fb_tmp = pykms.DumbFramebuffer(card, fbX, fbY, 'XR24');
+ big_fb_list.append(fb_tmp)
+
+fb = big_fb_list[0]
+screen_offset = 0
+
+card.disable_planes()
+for i in range(0, len(conn_list)):
+ conn = conn_list[i]
+ crtc = crtc_list[i]
+ mode = mode_list[i]
+
+ plane = res.reserve_generic_plane(crtc)
+ plane_list.append(plane)
+
+ modeb = mode.to_blob(card)
+ req = pykms.AtomicReq(card)
+ req.add(conn, 'CRTC_ID', crtc.id)
+ req.add(crtc, {'ACTIVE': 1,
+ 'MODE_ID': modeb.id})
+ req.add(plane, {'FB_ID': fb.id,
+ 'CRTC_ID': crtc.id,
+ 'SRC_X': screen_offset << 16,
+ 'SRC_Y': 0 << 16,
+ 'SRC_W': mode.hdisplay << 16,
+ 'SRC_H': mode.vdisplay << 16,
+ 'CRTC_X': 0,
+ 'CRTC_Y': 0,
+ 'CRTC_W': mode.hdisplay,
+ 'CRTC_H': mode.vdisplay,
+ 'zorder': 0})
+
+ req.commit_sync(allow_modeset = True)
+
+ screen_offset += mode.hdisplay
+
+# Double buffering, page flipping
+class bigFB_db:
+ def __init__(self, fb1, fb2):
+ self.speed_y = random.randrange(1, 10, 1)
+ self.dir_y = random.randrange(-1, 3, 2)
+ self.first_run = True
+ self.fbs = [fb1,fb2]
+ self.draw_buf = 0
+ self.fbX = fb1.width
+ self.fbY = fb1.height
+ self.pos_y = self.fbY // 2
+ self.old_pos_y = -1
+ # 5 + 10 + 15 + 10 + 5 = 45
+ self.bar_size = 45
+ self.flips = 0
+ self.frames = 0
+ self.time = 0
+ self.flip_count = 100
+
+ def new_color(self):
+ r = random.randrange(255)
+ g = random.randrange(255)
+ b = random.randrange(255)
+ self.color = pykms.RGB(r, g, b)
+ self.color2 = pykms.RGB(r // 2, g // 2, b // 2)
+ self.color3 = pykms.RGB(r // 3, g // 3, b // 3)
+ def move_stripe(self):
+ if self.first_run:
+ self.new_color()
+ self.first_run = False
+
+ fb = self.fbs[self.draw_buf]
+
+ old_box_y = self.old_pos_y
+ self.old_pos_y = self.pos_y
+ change_speed = 0
+
+ self.pos_y = int(self.pos_y + (self.dir_y * self.speed_y))
+
+ if self.pos_y < 0:
+ self.pos_y = 0
+ change_speed = 1
+ self.dir_y = 1
+ elif self.pos_y > (self.fbY - self.bar_size):
+ self.pos_y = self.fbY - self.bar_size
+ change_speed = 1
+ self.dir_y = -1
+
+ if change_speed == 1:
+ self.new_color()
+ self.speed_y = random.randrange(1, 10, 1)
+
+ # Erease the old box
+ if old_box_y >= 0:
+ pykms.draw_rect(fb, 0, old_box_y, self.fbX, self.bar_size, black)
+
+ pos_y = self.pos_y
+ pykms.draw_rect(fb, 0, pos_y, self.fbX, 5, self.color3)
+ pos_y += 5
+ pykms.draw_rect(fb, 0, pos_y, self.fbX, 10, self.color2)
+ pos_y += 10
+ pykms.draw_rect(fb, 0, pos_y, self.fbX, 15, self.color)
+ pos_y += 15
+ pykms.draw_rect(fb, 0, pos_y, self.fbX, 10, self.color2)
+ pos_y += 10
+ pykms.draw_rect(fb, 0, pos_y, self.fbX, 5, self.color3)
+
+ def handle_page_flip_single(self):
+ self.draw_buf ^= 1
+ self.move_stripe()
+
+ # one atomic request to flip on all displays/crtcs
+ fb = self.fbs[self.draw_buf]
+ screen_offset = 0
+
+ req = pykms.AtomicReq(card)
+ for i in range(0, len(conn_list)):
+ crtc = crtc_list[i]
+ mode = mode_list[i]
+
+ plane = plane_list[i]
+
+ req.add(plane, {'FB_ID': fb.id,
+ 'CRTC_ID': crtc.id,
+ 'SRC_X': screen_offset << 16,
+ 'SRC_Y': 0 << 16,
+ 'SRC_W': mode.hdisplay << 16,
+ 'SRC_H': mode.vdisplay << 16,
+ 'CRTC_X': 0,
+ 'CRTC_Y': 0,
+ 'CRTC_W': mode.hdisplay,
+ 'CRTC_H': mode.vdisplay,
+ 'zorder': 0})
+
+ screen_offset += mode.hdisplay
+
+ req.commit(0)
+
+ def handle_page_flip_separate(self):
+ self.draw_buf ^= 1
+ self.move_stripe()
+
+ # ask to flip the first screen
+ fb = self.fbs[self.draw_buf]
+ screen_offset = 0
+
+ # add separate atomic request for each display (crtc)
+ for i in range(0, len(conn_list)):
+ req = pykms.AtomicReq(card)
+ crtc = crtc_list[i]
+ mode = mode_list[i]
+
+ plane = plane_list[i]
+
+ req.add(plane, {'FB_ID': fb.id,
+ 'CRTC_ID': crtc.id,
+ 'SRC_X': screen_offset << 16,
+ 'SRC_Y': 0 << 16,
+ 'SRC_W': mode.hdisplay << 16,
+ 'SRC_H': mode.vdisplay << 16,
+ 'CRTC_X': 0,
+ 'CRTC_Y': 0,
+ 'CRTC_W': mode.hdisplay,
+ 'CRTC_H': mode.vdisplay,
+ 'zorder': 0})
+
+ screen_offset += mode.hdisplay
+
+ req.commit(0)
+
+ def handle_page_flip_main(self, frame, time):
+ self.flip_count += 1
+
+ if self.flip_count < len(conn_list):
+ return
+
+ self.flip_count = 0
+
+ # statistics
+ self.flips += 1
+ if self.time == 0:
+ self.frames = frame
+ self.time = time
+
+ time_delta = time - self.time
+ if time_delta >= 5:
+ frame_delta = frame - self.frames
+ print('Frame rate: %f (%u/%u frames in %f s)' %
+ (frame_delta / time_delta, self.flips, frame_delta, time_delta))
+
+ self.flips = 0
+ self.frames = frame
+ self.time = time
+
+ if args.flipmode == 'single':
+ self.handle_page_flip_single()
+ elif args.flipmode == 'separate':
+ self.handle_page_flip_separate()
+
+print('Press ENTER to exit\n')
+
+box_db = bigFB_db(big_fb_list[0], big_fb_list[1])
+box_db.handle_page_flip_main(0, 0)
+
+def readdrm(fileobj, mask):
+ for ev in card.read_events():
+ if ev.type == pykms.DrmEventType.FLIP_COMPLETE:
+ box_db.handle_page_flip_main(ev.seq, ev.time)
+
+def readkey(fileobj, mask):
+ sys.stdin.readline()
+ exit(0)
+
+sel = selectors.DefaultSelector()
+sel.register(card.fd, selectors.EVENT_READ, readdrm)
+sel.register(sys.stdin, selectors.EVENT_READ, readkey)
+
+while True:
+ events = sel.select()
+ for key, mask in events:
+ callback = key.data
+ callback(key.fileobj, mask)