Apalis iMX8 and Ixora Carrier Board LVDS issue

We are using IXORA Carrier Board v1.2, Apalis iMX8 (SoM), Toradex Embedded Linux reference-multimedia-image 6.1.0+ build.5(2023-01-05) for our development. We are developing an application with a 18.5 inch AUO Display unit using LVDS connection. But we are not able to get any picture on it, when we are connecting a 7 inch display with HDMI port, we are getting picture successfully.

Below is the connection list for LVDS

AUO Model -G185HAN01.0
LVDS 30 Pin Connector IXORA X19 PIN
Pin OUT Signal Name to be connected
1 .RXOIN0- 21.LVDS1_A_TX0_N
2.RXOIN0+ 19.LVDS1_A_TX0_P
3.RXOIN1- 15.LVDS1_A_TX1_N
4.RXOIN1+ 13.LVDS1_A_TX1_P
5.RXOIN2- 9.LVDS1_A_TX2_N
6.RXOIN2+ 7.LVDS1_A_TX2_P
7.GND 2.GND
8.RXOCLKIN- 27.LVDS1_A_CLK_N
9.RXOCLKIN+ 25.LVDS1_A_CLK_P
10.RXOIN3- 3.LVDS1_A_TX3_N
11.RXOIN3+ 1.LVDS1_A_TX3_P
12.RXEIN0- 10.LVDS1_B_TX0_N
13.RXEIN0+ 12.LVDS1_B_TX0_P
14.GND 5.GND
15.RXEIN1- 16.LVDS1_B_TX1_N
16.RXEIN1+ 18.LVDS1_B_TX1_P
17.GND 11.GND
18.RXEIN2- 22.LVDS1_B_TX2_N
19.RXEIN2+ 24.LVDS1_B_TX2_P
20.RXECLKIN- 4.LVDS1_B_CLK_N
21.RXECLKIN+ 6.LVDS1_B_CLK_P
22.RXEIN3- 28.LVDS1_B_TX3_N
23.RXEIN3+ 30.LVDS1_B_TX3_P
24.GND 26.GND
25.NC NC
26.NC NC
27.NC NC
28.VDD 34.LVDS1_5V_SW
29.VDD 34.LVDS1_5V_SW
30.VDD 34.LVDS1_5V_SW
LCD Side 5 Pin Connector
Pin No Ixora X19 PIN Power Supply
1. VCC 12V+
2. GND GND
3. ENABLE 37.BKL1_ON
4.Dimming 35.PWM_BKL1
5.NC

Please guide us how to fix the problem.

LVDS interface is not enabled by default, You have to install appropriate Device Tree overlays to make it works. For our 10" LVDS display we are using apalis-imx8_lvds_overlay.dtbo and display-lt170410_overlay.dtbo. First overlay enables LVDS interface and second one set display parameters. You can take mentioned overlays and modify them according to your display parameters.

we set overlays display with preinstalled apalis-imx8_panel-cap-touch-10inch-lvds_overlay.dtbo and it is working. But only problem we found is getting dual display as attached,
may be we need to set 18.5 inch display settings as the configuration is for 10.1 inch. Please guide us how to reconfigure the parameters and install.



You need to create your own device tree overlay based on data from your display datasheet. You can use this source code as an example.

Thanks for the response.
Actually i want to know how to create dtbo file from dts file.
Also can you share dts file of precompiled dtbo
apalis-imx8_panel-cap-touch-10inch-lvds_overlay.dtbo as it works .Only few parameters may need to be changed.

Please check links provided in this answer

Hi @Somnath ,

One can create their custom dts file and generate dtbo accordingly. Please follow below article and you should able to generate your dtbo. If you face any issue in same kindly share exact steps followed and error you get so that we can verify same at our end.

Best Regards
Ritesh Kumar

Thanks it works.