Colibri IMX8X DSI to HDMI Adapter not working with 1024x768 resolution display

Technical Support
,
1

I am facing issue with driving 1024x768 display from Colibri IMX8X via DSI to HDMI adapter.
Display always shows blank screen.
however display with resolution 1980x1080 works fine with board.

for 1024x768 display, fbset o/p is

mode “1024x768-0”
# D: 0.000 MHz, H: 0.000 kHz, V: 0.000 Hz
geometry 1024 768 1024 768 16
timings 0 0 0 0 0 0 0
accel true
rgba 5/11,6/5,5/0,0/0
endmode

Westion.ini contents are

[output]
name=HDMI-A-1
mode=1024x768@60

cat /sys/class/drm/card1-HDMI-A-1/status
connected

cat /sys/class/drm/card1-HDMI-A-1/modes
1024x768
1024x768
1024x768
1024x768
800x600
800x600

Display shows ‘No Signal’
Display works fine when driven from a laptop.

Request to please guide us to resolve the issue.

Regards
Praveen

3

HI @Praveen,

Thank you for reaching out with your issue regarding the Colibri iMX8X and the DSI to HDMI adapter not working with a 1024x768 resolution display. It’s good to hear that displays with a resolution of 1980x1080 work fine, which suggests that the hardware setup and the adapter are fundamentally operational.

Additionally please share complete OS detail and version you are using with baseboard details along with display model/part number you are testing both working and non working.

You can also manually start weston for additional logs and share with us along with dmesg output. With provided information it seems like display timing in not correct which is confirmed by fbset output.

Please check similar post for more details

Best Regards
Ritesh Kumar

4

Hi Ritesh,

please find the following details

cat /etc/issue
TDX Wayland with XWayland 5.5.0-devel-20220218133815+build.0 (dunfell) \n \l
Colibri-iMX8X_Reference-Multimedia-Image

Baseboard is a customized board, developed as per our product. Initially we were using Toradex 7Inch display on RGB interface, now we want to use a bigger display, hence shifting to HDMI based display with DSI to HDMI adapter board.

Working display is DELL SE2422H (normal computer monitor)
issue display is IEI make Model DM-F12A

find attached documents for dmesg & weston logs

NotWorking.txt (4.5 KB)
Working.txt (4.0 KB)

Regards
Praveen

5

Hi @Praveen,

Thanks for sharing details and logs.
From logs it is not evident if there is any issue related to EDID.
May I ask you to test with BSP 6.3.0, reference multimedia image and let us know if you still see same issue.

Best Regards
Ritesh Kumar

6

Hi Ritesh,

I have tested with latest BSP 5.7 Image and does not work with it.
Display works with BSP 6.6 Image only for few minutes, display starts blinking on & off after some time.

Thanks & Regards
Praveen

7

Hi @Praveen,

Please test with BSP 6.3.0. You can download image here.

Best Regards
Ritesh Kumar

8

Hi Ritesh,

With BSP 6.3, screen is blank always.

Regards
Praveen

9

Hi @Praveen,

Okay, we quickly tested with BSP 6.3.0 using our Verdin DSI to HDMI and Waveshare 7 inch HDMI and this works fine.
Right now I don’t have Colibri DSI to HDMI with me, we will take some time to get and test with same.
In meanwhile if possible that you have any different make HDMI display with same resolution do test with same.

Best Regards
Ritesh Kumar

10

Hi @Praveen,

We manged to get Colibri DSI to HDMI adapter and tested with Colibri iMX8X running BSP 6.3.0 we are able to test lower resolution as well.
https://share.toradex.com/d9jj7ufo5kqu3pr

Best regards
Ritesh Kumar