OpenSTLinux/Yocto V4.0.0: unable to connect to Wayland display

[sbrov]

Hi,

me and my team are working on a project on STM32MP1-DK2.

While everything is working fine on the previous ecosystrem release (v3.1.0),

after updating to the latest release v4.0.0, our demo stop to work, even after recompiling.

This is caused by the following code:

wl_display * display = wl_display_connect(NULL);
if (display == NULL) {
   std::cout << "can't connect to wayland display" << std::endl;
   return false;
}

wl_display_connect keeps returning null and thus I cannot get the current Wayland display.

What's more interesting is that even the built-in "weston-info" tool has the same issue and in fact it doesnt work.

Can anyone help?

Thank you

[Kevin HUBER]

Hello @sbrov​ ,

Please can I have your full boot logs until the error?

Are you using a custom image from distribution, the developer package or the Starter Package?

Best Regards,

Kevin

[sbrov · Accepted solution]

As a reference for anyone encountering the same issue: starting with OpenSTLinux 4.0.1, Weston/Wayland runs under the dedicated non-root account "weston". Therefore you need to run any app dealing with wayland under this user, and not under "root" user.

You can read about it here: https://wiki.st.com/stm32mpu/wiki/Wayland_Weston_troubleshooting_grid

Thank you!