Ixora LVDS to KOE Display

Technical Support
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1

Hi!

So I have an KOE JDI Group Display with the following pins,
I would like some help to understand which pins I will connect to which pins on the Ixora board.

alt text

2

Hi @jaski.tx !

This seems to work out, I get picture doing the boot but as soon as X11 starts it goes over to HDMI instead.

I created a 10-monitor.conf looking like this, but it just seem to fail, any thoughts?

Section "Monitor"
    Identifier "HDMI-1"
    Option "ignore" "true"
EndSection
Section "Monitor"
    Identifier "LVDS-1"
EndSection
Section "Device"
    Identifier  "LVDS"
    Driver      "vivante"
    Screen        1
    Option      "fbdev"     "/dev/fb0"
    Option      "vivante_fbdev" "/dev/fb0"
    Option      "HWcursor"  "false"
EndSection
Section "Screen"
    Identifier    "Screen-0"
    Device        "LVDS"
    Monitor        "LVDS-1"
EndSection
3

HI @bohn

Could you provide the software version of your module?

Please share your device-tree and dmesg.log in a text file?

Thanks and best regards,
Jaski

4

dmesg.log

Not sure how i find device-tree and software version

5

Found that I missed the patch with the fix for mxc_hdmi.only_cea=1…

6

Hi

Not sure how i find device-tree and software version

uname -a for the Software version.

Have you done any changes to the Software you are using?
Where did you download the Software?

Best regards,
Jaski

7

Hi @bohn

Ok. Is the issue solved now?

8

Linux apalis-imx6 4.14.117-3.0.2+ge43e3a2 #1 SMP Wed Dec 11 07:07:41 UTC 2019 armv7l GNU/Linux

9

We have our own meta-layer, we’re not using your default dists

10

Hi @jaski.tx , no unfortunately not!

With the current setting: dmesg.log

 Kernel command line: quiet enable_wait_mode=off vmalloc=400M ip=off root=PARTUUID=fc4d4e86-02 ro,noatime rootfstype=ext4 rootwait fec_mac=00:14:2d:a0:c7:c7 consoleblank=0 no_console_suspend=1 console=tty1 console=ttymxc0,115200n8 video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:dev=ldb,800x480M@60,if=RGB666 ldb=sin0 fbmem=32M

I get Can’t open display :0.0 when i try to do xrandr -q

11

Hi @bohn and Welcome to the Toradex Community!

Sorry for the delayed answer.

It seems, that you have single channel 18-bit display.

The VDD Pin 1 and 2 from the display should be connected to Pin 32 for 3.3V or 34 for 5V.

You need to connect to LVDS1_A_TX0_N to IN0-, … till LVDS1_A_TX2_N to IN2-. The LVDS1_A_TX3_P and LVDS1_A_TX3_N, could be kept unconnected. Further all the Pins LVDS1_B_xx can be kept unconnected.

Pixel Clock (14, 15) should be connected to LVDS1_A_CLK_X (25, 27).
The Pins (3, 4) can be kept unconnected.
And the Pin 20 from the display should be connected to Pin 35 of the LVDS connector on Ixora.
Finally for the backlight, you need to connect Pin1 to Pin 39/40 of the LVDS Connector on Ixora.

If you still have questions, please feel free to ask.

Best regards,
Jaski

12

Perfect that it works, Thanks for the feedback.

13

@jaski.tx

I solved this now, I had it correct all along, all but the resolution that I accidentally put it wrong…

Thanks for all help!