@Alex-Kushleyev - thanks, I submitted the RMA request, will let you know after I have the chance to replace and test the replacement parts.
Thanks, Hector

@berayksl : If your problem is with the height estimate and your VIO is working well and gives you good estimates of altitude, try disabling the barometer as well: SYS_HAS_BARO = disable, SYS_HAS_GPS = disable.

@berayksl - we have an indoor lab . There is a large steel table on one side of the room that affects the magnetometer. The drone has to stay away from that object to be able to arm. Large ferromagnetic objects definitely affect the magnetometer. Can you arm and fly position mode in a regular room with magnetometer enabled and GPS disabled ?

@berayksl : IN my case the problem has not appeared again (fingers crossed !) since I deactivated GPS from the EKF2.
From what you described above, it seems you also deactivated the magnetometer (SYS_HAS_MAG = 0), have you tried to enable that ?
Lack of magnetometer may lead to unstable EKF2 sensor fusion ?

@Alex-Kushleyev : here is the output:

[  206.798954] RTW: wlan0- hw port(0) mac_addr =00:c0:ca:b3:a6:e5
[  206.801089] qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x40d00
[  206.801105] qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x40d00
[  215.356522] CAM_INFO: CAM-CRM: cam_req_mgr_process_flush_req: 2177 Last request id to flush is 5890
[  215.356586] CAM_INFO: CAM-ISP: __cam_isp_ctx_flush_req_in_top_state: 3046 Last request id to flush is 5890
[  215.356694] CAM_INFO: CAM-ISP: __cam_isp_ctx_flush_req_in_top_state: 3069 Stop HW complete. Reset HW next.
[  215.367444] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1117 CAM_STOP_DEV Success, sensor_id:0x356,sensor_slave_addr:0x30
[  215.367450] CAM_INFO: CAM-CSIPHY: cam_csiphy_core_cfg: 982 STOP_DEV: CSIPHY_IDX: 0, Device_slot: 0, Datarate: 592000000, Settletime: 2800000000
[  215.367473] CAM_INFO: CAM-ISP: cam_ife_mgr_release_hw: 4755 Release HW success ctx id: 2
[  215.368902] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.79
[  215.372057] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.60
[  215.372072] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.56
[  215.372085] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.58
[  215.372128] CAM_INFO: CAM: cam_res_mgr_shared_pinctrl_put: 270 Need hold put this pinctrl
[  215.372143] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1047 CAM_RELEASE_DEV Success, sensor_id:0x356,sensor_slave_addr:0x30
[  216.395442] msm_vidc:   err : 00000002: h264e: msm_comm_flush: Already in flush
[  216.508604] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1117 CAM_STOP_DEV Success, sensor_id:0x577,sensor_slave_addr:0x34
[  216.508616] CAM_INFO: CAM-CSIPHY: cam_csiphy_core_cfg: 982 STOP_DEV: CSIPHY_IDX: 1, Device_slot: 0, Datarate: 1500000000, Settletime: 2200000000
[  216.515038] CAM_INFO: CAM-ISP: cam_ife_mgr_release_hw: 4755 Release HW success ctx id: 0
[  216.515922] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.79
[  216.517960] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.56
[  216.517973] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.60
[  216.517986] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.58
[  216.518049] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1047 CAM_RELEASE_DEV Success, sensor_id:0x577,sensor_slave_addr:0x34
[  216.618202] CAM_INFO: CAM-CRM: cam_req_mgr_process_flush_req: 2177 Last request id to flush is 5927
[  216.618268] CAM_INFO: CAM-ISP: __cam_isp_ctx_flush_req_in_top_state: 3046 Last request id to flush is 5927
[  216.618374] CAM_INFO: CAM-ISP: __cam_isp_ctx_flush_req_in_top_state: 3069 Stop HW complete. Reset HW next.
[  216.621881] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1117 CAM_STOP_DEV Success, sensor_id:0x356,sensor_slave_addr:0x30
[  216.621891] CAM_INFO: CAM-CSIPHY: cam_csiphy_core_cfg: 982 STOP_DEV: CSIPHY_IDX: 2, Device_slot: 0, Datarate: 592000000, Settletime: 2800000000
[  216.628363] CAM_INFO: CAM-ISP: cam_ife_mgr_release_hw: 4755 Release HW success ctx id: 3
[  216.629040] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.79
[  216.633125] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.60
[  216.633166] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.56
[  216.633212] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.59
[  216.633667] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1047 CAM_RELEASE_DEV Success, sensor_id:0x356,sensor_slave_addr:0x30
[  216.687846] CAM_INFO: CAM-CRM: cam_req_mgr_process_flush_req: 2177 Last request id to flush is 5930
[  216.687904] CAM_INFO: CAM-ISP: __cam_isp_ctx_flush_req_in_top_state: 3046 Last request id to flush is 5930
[  216.687998] CAM_INFO: CAM-ISP: __cam_isp_ctx_flush_req_in_top_state: 3069 Stop HW complete. Reset HW next.
[  216.692371] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1117 CAM_STOP_DEV Success, sensor_id:0x356,sensor_slave_addr:0x30
[  216.692383] CAM_INFO: CAM-CSIPHY: cam_csiphy_core_cfg: 982 STOP_DEV: CSIPHY_IDX: 0, Device_slot: 1, Datarate: 592000000, Settletime: 2800000000
[  216.698841] CAM_INFO: CAM-ISP: cam_ife_mgr_release_hw: 4755 Release HW success ctx id: 1
[  216.699769] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.79
[  216.703840] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.60
[  216.703886] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.56
[  216.703919] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.58
[  216.705006] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 1047 CAM_RELEASE_DEV Success, sensor_id:0x356,sensor_slave_addr:0x30
[  216.712597] qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30080
[  216.721134] CAM_WARN: CAM-CRM: cam_req_mgr_close: 160 release invoked associated userspace process has died
[  216.761711] msm_vidc:   high: 00000002: h264e: Closed video instance: ffffffeefdebe000
[  216.761933] msm_vidc:   high: 00000001: h264e: Closed video instance: ffffffef0e100000
[  216.884653] CAM_ERR: CAM-MEM: cam_mem_mgr_create_debug_fs: 126 failed to create dentry
[  216.895769] CAM_INFO: CAM-HFI: cam_hfi_init: 878 Init IO1 : [0x10c00000 0xcf300000] IO2 [0xe0200000 0x1ed00000]
[  216.906058] CAM_INFO: CAM-ICP: cam_icp_mgr_hw_open: 3879 FW download done successfully
[  216.906072] CAM_INFO: CAM-ICP: cam_icp_mgr_process_dbg_buf: 2572 FW_DBG:CICP_FW_E : HFI  :QC_IMAGE_VERSION_STRING=CICP.FW.1.0-00079,OEM_IMAGE_VERSION_STRING=CRM,BUILD_TIME: Oct 17 2019 05:49:19,CACHE_ENABLED at icphostinterface.c:636 QC_IMAGE_VERSION_STRING=CICP.FW.1.0-00079 OEM_IMAGE_VERSION_STRING=CRM
[  216.906084] CAM_INFO: CAM-ICP: cam_icp_mgr_process_dbg_buf: 2572 FW_DBG:CICP_FW_E : HFI  :ELF variant: CACHE-ENABLED:T480:API_V2:USE_CDM_1_1: , API version: 0x2000049 at icphostinterface.c:637 QC_IMAGE_VERSION_STRING=CICP.FW.1.0-00079 OEM_IMAGE_VERSION_STRING=CRM
[  216.929300] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Linked as a consumer to regulator.58
[  216.931458] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Linked as a consumer to regulator.56
[  216.933569] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Linked as a consumer to regulator.60
[  216.933607] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Linked as a consumer to regulator.79
[  216.956534] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 918 Probe success,slot:0,slave_addr:0x30,sensor_id:0x356
[  216.956636] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.79
[  216.960823] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.60
[  216.960951] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.56
[  216.961062] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor0: Dropping the link to regulator.58
[  216.986327] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Linked as a consumer to regulator.58
[  216.986474] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Linked as a consumer to regulator.60
[  216.986534] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Linked as a consumer to regulator.56
[  216.986670] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Linked as a consumer to regulator.79
[  217.000967] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 918 Probe success,slot:1,slave_addr:0x34,sensor_id:0x577
[  217.001068] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.79
[  217.003181] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.56
[  217.003308] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.60
[  217.003456] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor1: Dropping the link to regulator.58
[  217.029376] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Linked as a consumer to regulator.59
[  217.031600] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Linked as a consumer to regulator.56
[  217.033826] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Linked as a consumer to regulator.60
[  217.033928] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Linked as a consumer to regulator.79
[  217.057861] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 918 Probe success,slot:2,slave_addr:0x30,sensor_id:0x356
[  217.058009] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.79
[  217.062570] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.60
[  217.062700] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.56
[  217.062812] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.59
[  217.085707] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Linked as a consumer to regulator.60
[  217.087825] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Linked as a consumer to regulator.59
[  217.089993] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Linked as a consumer to regulator.55
[  217.092187] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Linked as a consumer to regulator.79
[  217.695551] RTW: wlan0- hw port(0) mac_addr =00:c0:ca:b3:a6:e5
[  218.274338] msm_vidc:   err : ffffffff: .....: DBLP Set: status 0
[  218.624174] CAM_ERR: CAM-CCI: cam_cci_read: 1320 wait_for_completion_timeout rc = -110 FIFO buf_lvl: 0x0
[  220.128139] CAM_ERR: CAM-CCI: cam_cci_flush_queue: 53 wait timeout
[  220.128236] CAM_ERR: CAM-CCI: cam_cci_read_bytes: 1613 failed to read rc:-110
[  220.128248] CAM_ERR: CAM-SENSOR: cam_cci_i2c_read: 35 rc = -110
[  220.128262] CAM_WARN: CAM-SENSOR: cam_sensor_match_id: 707 read id: 0x0 expected id 0x2975:
[  220.130622] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Dropping the link to regulator.79
[  220.132521] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Dropping the link to regulator.55
[  220.132641] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Dropping the link to regulator.60
[  220.132787] qcom,camera ac50000.qcom,cci:qcom,cam-sensor3: Dropping the link to regulator.59
[  220.160433] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Linked as a consumer to regulator.58
[  220.163839] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Linked as a consumer to regulator.56
[  220.166217] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Linked as a consumer to regulator.60
[  220.166422] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Linked as a consumer to regulator.79
[  220.191299] CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 918 Probe success,slot:6,slave_addr:0x30,sensor_id:0x356
[  220.191460] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.79
[  220.195732] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.60
[  220.195860] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.56
[  220.195969] qcom,camera ac4f000.qcom,cci:qcom,cam-sensor6: Dropping the link to regulator.58
[  220.255634] CAM_WARN: CAM-CRM: cam_req_mgr_close: 160 release invoked associated userspace process has died
[  229.072542] RTW: wlan0- hw port(0) mac_addr =00:c0:ca:b3:a6:e5

Let me know what else is needed. Thanks, Hector

@berayksl : I had similar behavior on a Starling2: after arming on position mode, sometimes it would fly fine, other times it would take off vertically at fast speed and only option to stop it would be the kill switch.
Have you tried to set the parameter SYS_HAS_GPS to "disable" in QGroundControl ? In my case it made a huge difference. If you are flying indoors (no GPS) but keep the GPS active on EKF2, it seems to deteriorate the sensor fusion, leading to inconsistent estimates of altitude that can lead to instability in the vertical axis.

@Alex-Kushleyev : got the output of dmesg. It is too large to cut and paste here, but you can download the text file from this link:
https://quickconnect.to/asapstorage/d/s/144lSyeQPPdNEZhCoWVCOjXUTudhlakC/Yfk8uh0E8Vk96kuc_96XHvRM6svAJSIF-bLWAR1fcaQw
(dont click on the link: copy and paste to a browser window).
Or send me the syntax to get a filtered output as you have above. Thanks.

@Alex-Kushleyev said in Starling 2: TOF sensor not recognized by VOXL Portal:

[ 1712.679736] qcom,camera ac50000.qcom,cci:qcom,cam-sensor2: Dropping the link to regulator.60

Can you send me the syntax to get the dmesg output from voxl-camera-server -l ? I've tried a few options but I do not get an output that looks like the one you show. Thanks.

@george-kollamkulam : the problem with the drone shooting straight up in position mode seems related to bad estimation of altitude. In particular, if you are flying indoors (no GPS signal accessible) GPS needs to be eliminated from the altitude estimation since the lack of GPS signal in the sensor fusion seems to cause the problem.
IN summary, if you are flying indoors and experience this problem, try disabling GPS in PX4 by setting the parameter SYS_HAS_GPS to "disable" in QGroundControl. That seems to have resolved the issue for us - at least for now.

Hello,
After fresh IMU and gyro calibration, and with successful check of VIO (via VOXL portal) Starling 2 is able to arm in position mode and fly in position mode rather well. However, as soon as switching to offboard mode (in this case to test follow_tag) flight becomes unstable: drone starts to very quick climbing straight up in the vertical direction.
It seems this kind of failure (drone starts climbing up fast straight in the vertical direction) seems a relatively common failure mode when going to offboard mode. Are there any suggestions of what can be causing this ? VIO has been tested multiple times and looks solid. Drone is able to arm in position mode.
Please let me know your suggestions. Thanks.