iMX8: No default display support on wayland

[sivasubramanian]

Hi,

My application is trying to get the eglDisplay using below code

display = eglGetDisplay( EGL_DEFAULT_DISPLAY );

on iMX8m where Wayland display system is used, but I'm getting the below error

EGL: Warning: No default display support on wayland

Is EGL_DEFAULT_DISPLAY not supported on Wayland as warned above or am I

supposed to do anything special here?

[alexkl]

I mean - it seems this message is intentional, would it be possible for NXP to add default display support for Wayland in the imx-gpu-viv driver? Right now there's a good amount of GPU frameworks out there that fail with this error.

[304338916]

Hello,

Did you find the answer to your question, I also encountered related problems.

regards

MoreyLiu

[sivasubramanian]

Please make sure WAYLAND_DISPLAY and XDG_RUNTIME_DIR are exported as required. Strangely this error vanished when we launch the Wayland client application in the same minicom (instead of ssh terminal) where the compositor is launched.

[304338916]

Hello,

Can you give me more information?

I don't know how to set the value of WAYLAND_DISPLAY and XDG_RUNTIME_DIR.

best regards

MoreyLiu

[sivasubramanian]

Hi,

Which compositor you use? check that for the display it created & export like below. 

export WAYLAND_DISPLAY=wayland-0      // Compositor created display

export XDG_RUNTIME_DIR=/tmp               // can be some temporary dir

[Yuri]

Hello,

  Use "i.MX_Linux_User's_Guide.pdf"  from Linux  doc package for some details.

Regards,

Yuri.

[jamesbone]

‌,  Can you please continue the follow up?

[sivasubramanian]

Thanks Yuri for the document information :-)

[Yuri]

Hello,

  Is any display selected in U-boot environment?

Also corresponding .dts  file, supporting display, should be used 

Regards,

Yuri.

[sivasubramanian]

Hi Yuri,

How can we check which display is selected in U-boot environment? boot logs?

[Yuri]

Hello,

  Use section 4.7 (Running Linux OS on the target) of "i.MX_Linux_User's_Guide.pdf"

for more details.  Display settings also are provided in the device tree file, which name

is set in fdt_file U-boot environment variable. For example, FAT partition of demo boot

SD card contains several configuration (fdt) files.  

Regards,

Yuri.

[diegoadrian]

Hello

Which BSP version are you using?

Best Regards,

Diego.

[sivasubramanian]

i.MX Linux Yocto Project BSP 4.9.51_8mq_ga Release, If I'm correct. ‌ correct me if not.

[diegoadrian]

Hello,

Can you please try exporting the below variable with the below command.

export DISPLAY=:0.0

Best Regards,

Diego. 

[sivasubramanian]

Hi Diego,

Thanks for suggesting. I tried that export DISPLAY=:0.0, but no help. Meanwhile, wl_display_connect() is behaving differently as below when invoked from ssh terminal as against launching from standard minicom serial terminal (working properly). Any thoughts on this as the same wl_display_connect() which works on serial terminal,  doesn't work when launched from ssh terminal?

failed to connect to wayland display: westeros-0

here westeros-0 is the display created by Wayland compositor.