Problem with LCD-OlinuXino-15.6FHD and T2-OLinuXino-LIME2-s16M-IND

Started by kontaktasa, May 01, 2022, 11:38:06 am

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kontaktasa

Hello,
I'm trying to use the new 15.6FHD LCD screen (LCD-OLinuXino-15.6FHD - rev. H 2018) with new ,,T2-OlinuXino-LIME2-s16M-IND - rev. L". In the SD card I wrote ,,A20-OlinuXino-bullseye-base-20220413-094751" (Recommended Linux image).

I use "A20-OlinuXino-LIME2-UEXT" adapter to connect "LCD-OlinuXino-15.6FHD" to "T2-OlinuXino-LIME2-s16M-IND". In OS I run command ,,sudo olinuxino-display" and reboot system to activate LCD. After Reboot LCD screen trun's on, but show's artifacts..
https://drive.google.com/file/d/1dko5Ogko-AN4DhVSbeMUYbbdF8Pgh26D/view?usp=sharing
What may be wrong?

kontaktasa

I used a "olinuxino monitor set" command on the U-boot console and selected "LCD-OLinuXino-15.6FHD" video output. After that LCD screen starts to show boot log, but when OS booted still show's artifacts or the black screen. Maybe the new ,,A20-OlinuXino-bullseye-base-20220413-094751" OS has bugs? Where could I download an older version of "A20-OlinuXino-bullseye"? 
https://drive.google.com/file/d/1cyEKGn3Pd9ZbkSskMPcsLr-f3g8vGKU2/view?usp=sharing

LubOlimex

You need to run "olinuxino-display" after display. Select the proper display and when prompted restart. Refer to this screenshot:

https://i.imgur.com/yA362qV.jpg
Technical support and documentation manager at Olimex

kontaktasa

As I wrote in the my first post, I run the command "olinuxino-display". After this command the screen turns on but does not show the desktop. Only black screen and sometimes the screen shows image artifacts (white lines). In the video (link below) I show my problem.
https://drive.google.com/file/d/1k4fjsmwQs9WGU6CflBJqs1O-t9cz8zHY/view?usp=sharing

LubOlimex

From the video - it is good sign that there is data coming on the screen from u-boot, but all stops as soon as kernel starts. This means there is no hardware damage with the display and that the connection is alright. To me it appears that the 15.6 image is not supported in Olimage despite its entry in the list. I've notified the developers.

Meanwhile you might test with sunxi images and older instructions from here:

https://ftp.olimex.com/Allwinner_Images/A20-OLinuXino-LIME2/Debian/sd/a20-lime2_mainline_uboot_sunxi_kernel_3.4.103_jessie_eMMC_rel_16.zip

Refer to the FAQ at the bottom of the product page:

https://www.olimex.com/Products/OLinuXino/LCD/LCD-OLinuXino-15.6FHD/open-source-hardware
Technical support and documentation manager at Olimex

kontaktasa

I tested a20-lime2_mainline_uboot_sunxi_kernel_3.4.103_jessie_eMMC_rel_16
and now LCD is work great! :)

When can I expect fixes for the new version of OLinuXino?

LubOlimex

Hard to estimate, I've added it as an issue in our TODO list, but the developers are quite overwhelmed with a lot of projects. The 15.6 inch display has different interface compared to rest of our displays (LVDS serial vs RGB parallel) so I am not sure how fast can it be done.
Technical support and documentation manager at Olimex

kontaktasa

On the same topic. I am trying to use the LCD screen 15.6 (LCD-OLinuXino-15.6 (1366x768), (LCD PCB - "LCD-OLinuXino-15.6FHD - rev.E 2014") with "T2-OlinuXino-MICRO-IND - rev. M" on SD card I wrote "A20-OlinuXino-bullseye-base-20220413-094751" (recommended Linux image).

The LCD 15,6 display works properly as long as an external monitor is connected via HDMI or at least an HDMI to VGA adapter. If the Olinuxino boots OS with a disconnected monitor or HDMI adapter, artifacts (running lines) appear on the LCD 15,6 screen.

I tried to use "HDMI Dummy Plug (4K UHD)", but it not solved the problem.

Maybe someone can comment where the problem is? Maybe it has something to do with the screen resolution settings? Is this an operating system bug again?

LCD PCB
https://drive.google.com/file/d/1sBoAuHeA-WuvtIiJQduaR7JydzGQPlT9/preview
HDMI to VGA adapter connected to Olinuxino(LCD working)
https://drive.google.com/file/d/1Yaryxvj3EdVzlMR6f2sWn-pWBDE1Z2F0/preview
HDMI not connected to Olinuxino(LCD artefacts)
https://drive.google.com/file/d/1X6nzaXfD-erTHbR5Osz1lRb5NvScgQYR/preview
HDMI Dummy Plug
https://drive.google.com/file/d/1T_c-_21V1--JuS_YOScQYlAVs0dRDZAt/preview