DRM Access Error: Page flip commit failed on device during greeter session

[mirkobrombin]

While running the greeter, the following error occurs:

and the following gets logged in the journal:

DRM access error: Page flip commit failed on device `Some("/dev/dri/card0")` (Permission denied (os error 13))

Extended journal

Jan 24 09:40:37 vos cosmic-comp[22293]: [GL] GL_INVALID_VALUE in glTexSubImage2D(xoffset 0 + width 24 > 16)
Jan 24 09:40:48 vos cosmic-comp[22293]: [GL] GL_INVALID_VALUE in glTexSubImage2D(xoffset 0 + width 24 > 10)
Jan 24 09:41:22 vos cosmic-comp[22293]: [GL] GL_INVALID_VALUE in glTexSubImage2D(xoffset 0 + width 24 > 9)
Jan 24 09:41:47 vos cosmic-comp[22293]: [GL] GL_INVALID_VALUE in glTexSubImage2D(xoffset 0 + width 24 > 9)
Jan 24 09:41:53 vos cosmic-comp[22293]: Failed to submit rendering: Failed to submit result for display

                                        Caused by:
                                            0: The underlying drm surface encountered an error: DRM access error: Page flip commit failed on device `Some("/dev/dri/card0")` (Permission denied (os error 13))
                                            1: DRM access error: Page flip commit failed on device `Some("/dev/dri/card0")` (Permission denied (os error 13))
                                            2: Permission denied (os error 13)

                                        Stack backtrace:
                                           0: <unknown>

Specs

[Drakulix]

I am not sure, if the page flip error isn't mostly a symptom of the greeter crashing.
pop-os/cosmic-greeter#180 should fix that particular issue, please tell me, if this error persists after said fix.

[mirkobrombin]

Hi, thanks for merging it. Just tested, while the warning disappeared, the issue persist. The output is the same, just without the warning.

[rengare]

I have it too, I'll get the master version and let you know
btw what is the best way to debug greeting? Should I run it inside another wayland session?

Edit
I added a video group to my user and it looks like its solves the issue
sudo usermod -a -G video $USER
also I found this post which points to late drm initialization of systemd
https://bbs.archlinux.org/viewtopic.php?id=250684

[mirkobrombin]

cosmic-greeter started working again after rebuilding all the cosmic desktop. Not sure what fixed it, for sure converting RPM packages to DEB was not so smart from my side.