topic Re: [i.MX8] How to share screen on Weston. in i.MX Processors

[i.MX8] How to share screen on Weston.

tan-k — Thu, 02 Sep 2021 06:31:05 GMT

Hi,

We are testing i.MX8 with below environment.

[Environment]
Evaluation Kit : 8MMINILPD4-EVK (Connect HDMI cable, USB keyboard and USB mouse.)
Linux for i.MX : Linux 5.10.9_1.0.0

We would like to share output screen.
So, we add as below to build rdp-backend.so.
---------------------------------------------------------
sources\meta-imx\meta-bsp\recipes-graphics\wayland\weston_9.0.0.imx.bbappend
#Add two lines.
DEPENDS += "freerdp"
EXTRA_OEMESON += "-Dbackend-rdp=true"
---------------------------------------------------------
Also, we edited weston.ini
---------------------------------------------------------
[core]
#gbm-format=argb8888
idle-time=0
use-g2d=1
xwayland=true
repaint-window=16
#enable-overlay-view=1
modules=screen-share.so <-- Add this line.
---------------------------------------------------------
We enter "Ctrl + Alt + S" key.
This is short cut key of Weston to share screen.
However we got the error message as below.
weston.log
---------------------------------------------------------
[05:47:47.435] Loading module '/usr/lib/weston/screen-share.so'
[05:47:47.440] Loading module '/usr/lib/weston/systemd-notify.so'
[05:47:47.440] info: add 1 socket(s) provided by systemd
[05:47:47.444] Loading module '/usr/lib/libweston-9/xwayland.so'
[05:47:47.649] Registered plugin API 'weston_xwayland_v1' of size 32
[05:47:47.649] Registered plugin API 'weston_xwayland_surface_v1' of size 16
[05:47:47.649] xserver listening on display :0
[05:47:47.649] launching '/usr/libexec/weston-desktop-shell'
[05:48:23.963] Screen share failed: No wl_shm found <-- Error message! What is this reason?
[05:48:23.963] unknown child process exited
---------------------------------------------------------
How can I share the screen on Weston?

Any help would be appreciated.

Thank you.

Best regards,

Re: [i.MX8] How to share screen on Weston.

Bio_TICFSL — Fri, 03 Sep 2021 13:48:22 GMT

Hello tan-k

The screen share should be supported on imx platform with wayland backend. At least I know there are customers used this features on imx6q

Here is how they did it on imx6 for your reference. Hope it helps.

Remote Desktop: How-To

weston -imx should be built with rdp-compositor and screen sharing enabled :
add --enable-screen-sharing and --enable-rdp-compositor to the weston configs
The rdp-compositor has a dependency to freerdp.
On target:
1/ Install the freerdp package on target : Make sure you have the TLS certificate/key couple server.crt and server.key (generally : at /etc/freerdp/keys)
2/ the command to fork a compositor with the rdp backend should be written in the weston.ini
(make sure to export HOME) :
at $HOME/.config/weston.ini add the following:
[screen-share]
command=/usr/bin/weston --backend=rdp-backend.so --shell=fullscreen-shell.so --no-clients-resize --rdp-tls-cert=/etc/freerdp/keys/server.crt --rdp-tls-key=/etc/freerdp/keys/server.key

2/ launch weston with the following command :

weston --tty=2 --backend=fbdev-backend.so --modules=screen-share.so --use-gl=1

3/ In order to do remote desktop with the screen-sharing a keyboard and a mouse should be connected to target:
when the compositor is up : do the ctrl+alt+s to fork the new compositor with rdp-backend that will share the screen through RDP

On Host:
launch an rdp client : on X e.g xfreerdp :
xfreerdp <target ip address>

When launching weston with the gl-renderer you should get the same desktop in your remote host.

Regards

Re: [i.MX8] How to share screen on Weston.

tan-k — Mon, 06 Sep 2021 03:44:47 GMT

Hi,

Thank you for your information!

We already set "screen-share" item in weston.ini (Attached our file) and load "screen-share.so".
Also we have the TLS certificate/key couple server.crt and server.key.
Do the ctrl+alt+s, then the new compositor failed with the error of "Screen share failed: No wl_shm found".
We changed "ExecStart" item in weston.service file (Attached our file).
Then we can connect remote desktop by using xfreerdp normally.
But the desktop is not shown on display.

We would like to get the same desktop in my remote host.
Do you have any solutions?

Best regards,

Re: [i.MX8] How to share screen on Weston.

danix2k — Fri, 23 Sep 2022 16:10:09 GMT

Hi @tan-k ,

I'm having the same behavior. How did you resolve that? I need to change something else in other conf file?

Thanks

Re: [i.MX8] How to share screen on Weston.

inetronic — Mon, 05 Dec 2022 14:45:21 GMT

Hi,

we had the same problem. Black remote screen with "use-g2d=1".

Uncomment it:

#use-g2d=1

With our hardware it works (slower because no 2D graphic accel.)

Re: [i.MX8] How to share screen on Weston.

romainmoura — Wed, 26 Jul 2023 15:34:43 GMT

Hello,
Same issue :
Screen share failed: No wl_shm found
Did someone find how to resolve it ?

Thanks

Re: [i.MX8] How to share screen on Weston.

himanshubhavani — Fri, 13 Oct 2023 08:44:17 GMT

Hi
Have you found any solution ?

Re: [i.MX8] How to share screen on Weston.

prashantdivate — Sun, 29 Oct 2023 06:30:06 GMT

Hi @tan-k @romainmoura
I succeeded in remotely access wayland application using RDP client in yocto environment

FYI-
full article
https://medium.com/@prashant-divate/remotely-accessing-wayland-based-applications-using-rdp-client-in-yocto-image-55f38b67e0aa

addressed in meta layer
https://github.com/prashantdivate/meta-sirius/tree/master

Re: [i.MX8] How to share screen on Weston.

prashantdivate — Sun, 29 Oct 2023 06:32:00 GMT

Hello @romainmoura

It looks like the screen-share module cannot find globals like `wl_compositor` and `wl_shm`, and screen sharing failed. So please add desktop shell in weston.ini file

Re: [i.MX8] How to share screen on Weston.

romainmoura — Sun, 29 Oct 2023 07:26:43 GMT

hello,

Thanks for your reply.

I fixed the issue a will ago, sorry for not posting the solution. I think there was issue in the weston.ini file. Here is mine which is working now :

Best regards