DJI O4 Lite + Goggles 3 shows video but no OSD on Matek H743 Slim V4 (Betaflight OSD works)

[jeddos392-art]

Hardware

Flight Controller:
Matek H743 Slim V4 (Genuine board)

Firmware tested:
INAV 9.0.1
INAV 9.1.0

Video System:
DJI O4 Air Unit Lite

Goggles:
DJI Goggles 3

Receiver:
ELRS

GPS:
Matek M10Q-5883 (QMC5883P)

---

Problem

Video works perfectly.

The DJI O4 Lite outputs video normally to Goggles 3.

However, INAV OSD never appears.

No battery voltage.
No GPS.
No flight mode.
Nothing.

Only camera video.

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What has been tested

✓ UART1 MSP DisplayPort

✓ UART3 MSP DisplayPort

✓ Different UART ports

✓ TX/RX swapped

✓ osd_video_system=AUTO

✓ DJI_NATIVE

✓ BFHDCOMPAT

✓ AVATAR

✓ O4 Lite replaced with another brand new unit

✓ Goggles 3 OSD mode switched between Betaflight and INAV

✓ Genuine Matek board

✓ Full erase and reflash

✓ INAV 9.0.1

✓ INAV 9.1.0

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Important Result

Exactly the same hardware

Exactly the same wiring

Exactly the same O4 Lite

Exactly the same Goggles 3

When flashing Betaflight:

OSD works.

Video and OSD are both displayed.

Only INAV has no OSD.

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CLI

status

OSD:
MSP DisplayPort [30x16]

VTX:
not detected

serial

serial 0 33554432 115200 115200 0 115200

UART1 is configured as MSP DisplayPort.

---

Question

Is there a known issue with MSP DisplayPort on
MATEKH743 target?

Could this be related to DJI O4 Lite compatibility?

Is there any debug build or patch I can test?

Thank you.

INAV_9.0.1_cli_20260727_193211_260727.txt

Timer overrides

Outputs [servo]

safehome

Fixed Wing Approach

geozone

geozone vertices

features

feature GPS
feature PWM_OUTPUT_ENABLE

beeper

blackbox

blackbox -NAV_ACC
blackbox NAV_POS
blackbox NAV_PID
blackbox MAG
blackbox ACC
blackbox ATTI
blackbox RC_DATA
blackbox RC_COMMAND
blackbox MOTORS
blackbox -GYRO_RAW
blackbox -PEAKS_R
blackbox -PEAKS_P
blackbox -PEAKS_Y
blackbox SERVOS

Receiver: Channel map

Ports

serial 0 33554432 115200 115200 0 115200
serial 1 2 115200 115200 0 115200

LEDs

LED color

LED mode_color

Modes [aux]

aux 0 0 0 1700 2100
aux 1 51 4 1700 2100
aux 2 1 1 900 1300
aux 3 2 1 1700 2100
aux 4 11 5 1700 2100
aux 5 10 3 1700 2100
aux 6 13 2 1300 1700

Adjustments [adjrange]

Receiver rxrange

temp_sensor

Mission Control Waypoints [wp]

#wp 0 invalid

OSD [osd_layout]

osd_layout 0 0 14 16 V
osd_layout 0 1 23 18 V
osd_layout 0 7 2 1 V
osd_layout 0 9 1 2 H
osd_layout 0 12 14 16 H
osd_layout 0 14 14 18 V
osd_layout 0 15 13 17 V
osd_layout 0 28 36 17 V
osd_layout 0 30 25 1 V
osd_layout 0 32 23 17 V
osd_layout 0 38 23 19 V
osd_layout 0 48 29 19 V

Programming: logic

Programming: global variables

Programming: PID controllers

OSD: custom elements

master

set gyro_main_lpf_hz = 90
set dynamic_gyro_notch_q = 250
set dynamic_gyro_notch_min_hz = 60
set dynamic_gyro_notch_mode = 3D
set setpoint_kalman_q = 200
set gyro_zero_x = 2
set gyro_zero_y = -16
set gyro_zero_z = 7
set ins_gravity_cmss = 978.523
set acc_hardware = ICM42605
set acczero_x = -11
set acczero_y = 4
set acczero_z = -1
set accgain_x = 4092
set accgain_y = 4099
set accgain_z = 4111
set align_mag = CW270FLIP
set mag_hardware = QMC5883P
set maggain_x = 324
set maggain_y = 111
set maggain_z = 365
set baro_hardware = SPL06
set pitot_hardware = VIRTUAL
set blackbox_rate_denom = 2
set motor_pwm_protocol = DSHOT300
set failsafe_procedure = RTH
set applied_defaults = 5
set airmode_type = THROTTLE_THRESHOLD
set osd_video_system = DJI_NATIVE
set i2c_speed = 800KHZ

control_profile

control_profile 1

set mc_p_pitch = 41
set mc_i_pitch = 87
set mc_d_pitch = 29
set mc_cd_pitch = 93
set mc_p_roll = 38
set mc_i_roll = 79
set mc_d_roll = 26
set mc_cd_roll = 85
set mc_p_yaw = 43
set mc_i_yaw = 82
set mc_cd_yaw = 92
set dterm_lpf_hz = 85
set mc_iterm_relax = RPY
set d_boost_min = 1.000
set d_boost_max = 1.200
set antigravity_gain = 2.000
set antigravity_accelerator = 5.000
set smith_predictor_delay = 1.768
set tpa_rate = 20
set tpa_breakpoint = 1200
set rc_yaw_expo = 70
set roll_rate = 60
set pitch_rate = 60
set yaw_rate = 50
set ez_enabled = ON
set ez_filter_hz = 90
set ez_response = 95
set ez_damping = 115
set ez_stability = 106
set ez_aggressiveness = 85
set ez_expo = 118

control_profile

control_profile 2

set mc_iterm_relax = RPY
set d_boost_min = 0.800
set d_boost_max = 1.200
set antigravity_gain = 2.000
set antigravity_accelerator = 5.000
set tpa_rate = 20
set tpa_breakpoint = 1200

control_profile

control_profile 3

set mc_iterm_relax = RPY
set d_boost_min = 0.800
set d_boost_max = 1.200
set antigravity_gain = 2.000
set antigravity_accelerator = 5.000
set tpa_rate = 20
set tpa_breakpoint = 1200

mixer_profile

mixer_profile 1

set model_preview_type = 3
set motorstop_on_low = OFF

Mixer: motor mixer

mmix reset

mmix 0 1.000 -1.000 1.000 -1.000
mmix 1 1.000 -1.000 -1.000 1.000
mmix 2 1.000 1.000 1.000 1.000
mmix 3 1.000 1.000 -1.000 -1.000

Mixer: servo mixer

mixer_profile

mixer_profile 2

Mixer: motor mixer

Mixer: servo mixer

battery_profile

battery_profile 1

battery_profile

battery_profile 2

battery_profile

battery_profile 3

restore original profile selection

control_profile 1
mixer_profile 1
battery_profile 1

save configuration

save