Atomic Modeset fails

[hundeboll]

Hi,

I'm trying to run flutter-embedded-linux on a buildroot based linux using the eglstream backend for an nvidia card. I've enabled modesetting on the command-line, but it fails like this:

# LD_LIBRARY_PATH=/root/drm/lib/ FLUTTER_DRM_DEVICE=/dev/dri/card0 ./flutter-drm-eglstream-backend -b drm/
[ERROR][native_window_drm_eglstream.cc(132)] Failed to commit an atomic property change request
[ERROR][elinux_window_drm.h(131)] Failed to create the native window (/dev/dri/card0).
Segmentation fault (core dumped)

The dmesg.log (with drm.debug=0xff on the command line) does give a hint about no framebuffer being set.

I am by no means an DRM expert, so any hints would be greatly appreciated.

[HidenoriMatsubayashi]

I'm trying to run flutter-embedded-linux on a buildroot based linux using the eglstream backend for an nvidia card.

Specifically, what device are you using? Also, did you run that command with sudo?

[HidenoriMatsubayashi]

Can you modify the source code as below and see what happens?

native_window_drm_eglstream.cc:

  drmModeAtomicFree(atomic);
  if (result != 0) {
    ELINUX_LOG(ERROR) << "Failed to commit an atomic property change request: " << result;
    // return false;  <= comment-out
  }

[hundeboll]

Running as root, yes. With the suggested changes:

# LD_LIBRARY_PATH=/root/drm/lib/ FLUTTER_DRM_DEVICE=/dev/dri/card0 ./flutter-drm-eglstream-backend -b drm/
[ERROR][native_window_drm_eglstream.cc(132)] Failed to commit an atomic property change request: -22
[ERROR][environment_egl_stream.cc(16)] Failed to set extension function pointers
[ERROR][context_egl.cc(71)] Failed to choose EGL surface config: eglGetError: EGL_BAD_DISPLAY
[ERROR][context_egl_stream.cc(20)] Failed to set extension function pointers
Segmentation fault (core dumped)

[HidenoriMatsubayashi]

[ERROR][native_window_drm_eglstream.cc(132)] Failed to commit an atomic property change request: -22

-22 means:

-EINVAL	if DRM_CLIENT_CAP_ATOMIC is not enabled, the value of flags is illegal, or atomic property IDs in the request are not recognized.

BTW, what device are you using?

[hundeboll]

NVIDIA GPU GeForce GTS 450 (GF106) NVIDIA GLX Module 390.151

[HidenoriMatsubayashi]

I see. I haven't tried this backend on desktop graphics cards.

Sorry, I can't think of anything right away. Need investigation.

[hundeboll]

No problem. Thanks for a prompt response!

[HidenoriMatsubayashi]

If you find a bug, please send a pull request :)