Apalis imx8qm V1.1B, HDMI DDC not working

Hello,
we have an Apalis V1.1B imx8 module mounted on a custom board and we have some problems with the DDC bus in HDMI. The HDMI works fine (the display works) but it gives the following error:

[drm:cdns_hdmi_connector_get_modes] ERROR Invalid edid

The dts that we are using is based on the ixora V1.2 dts and we have added the following to enable the DDC I2C bus:

pinctrl_lpi2c0: lpi2c0grp {
	fsl,pins = <
		/*		
		IMX8QM_HDMI_TX0_TS_SCL_DMA_I2C0_SCL		0x04000022
		IMX8QM_HDMI_TX0_TS_SDA_DMA_I2C0_SDA		0x04000022
		*/
		IMX8QM_HDMI_TX0_TS_SCL_HDMI_TX0_I2C0_SCL  0xc600004c
		IMX8QM_HDMI_TX0_TS_SDA_HDMI_TX0_I2C0_SDA  0xc600004c		
	>;
};

/* Apalis I2C2 (DDC) */
&i2c0 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_lpi2c0>;
	#address-cells = <1>;
	#size-cells = <0>;
	clock-frequency = <100000>;
	status = "okay";	
};

&hdmi {
	ddc-i2c-bus = <&i2c0>;
	status = "okay";	
};

The “get-edid -b 2” app hangs without output and the i2cdtect -y 2 command gives a very strange output (with very slow response):

root@av2x:/# i2cdetect -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 
10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 
20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 
30: -- -- -- -- -- -- -- -- 38 39 3a 3b 3c 3d 3e 3f 
40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f 
70: 70 71 72 73 74 75 76 77  

The rootfs is ubuntu 20.04 without any graphic support. The 205, 207 pins have pullup resistors at 3.3V and we use the HDMI2C1-14HDS for ESD protection. During the i2cdetect there is no activity at the I2C bus.

Do you have any advice?

Best Regards,
Giannis