Unable to become drm master Page flip commit failed`

[vadorovsky]

First of all, I'm totally unsure what's the good place for raising this question. It's an error thrown by smithay, which happens to me when trying to run COSMIC desktop on a specific hardware. Might be a smithay bug, might be a kernel bug, might be as well just a configuration issue, I'm not sure at this point. For now I'm posting it here, but let me know if I should move this somewhere else.

Getting to the point.

I'm trying to use COSMIC alpha6 desktop on a GPD Pocket 4 with AMD Ryzen AI 9 HX 370 / AMD Radeon™ 890M. Once I'm logging from cosmic-greeter (right after typing password and ENTER), the compositor crashes and the computer reboots.

The logs look like:

I think the important warnings are:

smithay::backend::drm::device::fd: Unable to become drm master, assuming unprivileged mode

cosmic_comp::backend::kms::surface: Failed to submit rendering: Failed to submit result for display
[...]
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))

(on the very bottom)

Both are related to smithay:

smithay/src/backend/drm/device/fd.rs

Lines 71 to 72 in 9c0f79b

	if dev.acquire_master_lock().is_err() {
	warn!("Unable to become drm master, assuming unprivileged mode");

smithay/src/backend/drm/surface/atomic.rs

Lines 884 to 900 in 9c0f79b

	let res = self
	.fd
	.atomic_commit(
	if event {
	AtomicCommitFlags::PAGE_FLIP_EVENT | AtomicCommitFlags::NONBLOCK
	} else {
	AtomicCommitFlags::NONBLOCK
	},
	req.build()?,
	)
	.map_err(|source| {
	Error::Access(AccessError {
	errmsg: "Page flip commit failed",
	dev: self.fd.dev_path(),
	source,
	})
	});

Everything else is probably just a noise (I'm using openrc, not systemd) and I see these logs on all my other machines, where COSMIC works. I think the D-Bus error is also unrelated (but I'll try to fix it, I probably need to adjust the greetd/display-manager openrc service to wait for dbus).

Any hints what might be wrong here and what should I look for next?

[cmeissl]

The warning about the unprivileged mode is rather harmless and can be ignored.
Not sure why the device is flagged is inactive as indicated by "Device is currently paused, operation rejected".

How did you install the COMSMIC Alpha?

Also can you check if you have any message from the kernel (dmesg)? Might also be interesting to enable drm debug logging for this. You can follow the instructions here to enable it https://github.com/swaywm/wlroots/wiki/DRM-Debugging

[vadorovsky]

The warning about the unprivileged mode is rather harmless and can be ignored. Not sure why the device is flagged is inactive as indicated by "Device is currently paused, operation rejected".

Good to know.

Regarding the D-Bus error, I see it also on my other machines, where COSMIC ends up starting successfully. So it's most likely not the cause of the failed starts on GPD Pocket, but still definitely something I need to sort out.

How did you install the COMSMIC Alpha?

I'm using Gentoo and I installed it through this third-party overlay with the following steps:

https://wiki.gentoo.org/wiki/COSMIC

I was the one writing this page, so I was figuring out the steps on my own. Please let me know if there is something wrong there. However, I used exactly the same steps on my PC and Thinkpad T13s and it works.

Also can you check if you have any message from the kernel (dmesg)? Might also be interesting to enable drm debug logging for this. You can follow the instructions here to enable it https://github.com/swaywm/wlroots/wiki/DRM-Debugging

Thanks! I'll try that and come back with the results.

[vadorovsky]

Here is my dmesg after enabling DRM debug and manually starting the display-manager service, which ends up starting greetd and cosmic-greeter.

It's huge and I'm still wrapping my head around it, I also didn't notice any straightforward error yet.

https://gist.github.com/vadorovsky/572201af9da54eec64f9de0c9cef114c

[vadorovsky]

@cmeissl I managed to get rid of the most of dbus-related errors by wrapping cosmic-comp in dbus-run-session. My current greetd config looks like:

[terminal]
vt = 7

[default_session]
command = "/usr/bin/dbus-run-session /usr/bin/cosmic-comp /usr/bin/cosmic-greeter >>/var/log/cosmic.log 2>&1"
user = "cosmic-greeter"

The crash still persists and the visible behavior is still the same. cosmic-greeter starts, I'm typing my password in, presing ENTER. And then COSMIC quickly shows for a second, then crashes and the system restarts.

The cosmic.log still ends with the same DRM / page flip commit message:

dbus-daemon[3012]: [session uid=600 pid=3012 pidfd=5] Reloaded configuration
�[2m2025-03-30T14:56:12.656238Z�[0m �[33m WARN�[0m �[2mcosmic_comp::logger�[0m�[2m:�[0m Failed to init journald logging. �[3merr�[0m�[2m=�[0mOs { code: 2, kind: NotFound, message: "No such file or directory" }
�[2m2025-03-30T14:56:12.663695Z�[0m �[31mERROR�[0m �[2mcosmic_comp::config�[0m�[2m:�[0m Failed to read config 'workspaces' �[3merr�[0m�[2m=�[0mNoConfigDirectory
�[2m2025-03-30T14:56:12.666851Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Period' only matched case insensitive for "period"
�[2m2025-03-30T14:56:12.666888Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Comma' only matched case insensitive for "comma"
�[2m2025-03-30T14:56:12.666895Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Period' only matched case insensitive for "period"
�[2m2025-03-30T14:56:12.666901Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Comma' only matched case insensitive for "comma"
�[2m2025-03-30T14:56:12.667010Z�[0m �[31mERROR�[0m �[2mcosmic_settings_config::shortcuts�[0m�[2m:�[0m shortcuts custom config error: GetKey("custom", Os { code: 2, kind: NotFound, message: "No such file or directory" })
�[2m2025-03-30T14:56:12.668179Z�[0m �[31mERROR�[0m �[2mcosmic_settings_config::window_rules�[0m�[2m:�[0m tiling exceptions custom config error: GetKey("tiling_exception_custom", Os { code: 2, kind: NotFound, message: "No such file or directory" })
�[2m2025-03-30T14:56:13.424948Z�[0m �[33m WARN�[0m �[2msmithay::backend::drm::device::fd�[0m�[2m:�[0m Unable to become drm master, assuming unprivileged mode
�[2m2025-03-30T14:56:13.867753Z�[0m �[33m WARN�[0m �[2mcosmic_comp::backend::render::cursor�[0m�[2m:�[0m Unable to load xcursor, using fallback cursor �[3merr�[0m�[2m=�[0mNoDefaultCursor
�[2m2025-03-30T14:56:13.955634Z�[0m �[33m WARN�[0m �[2mcosmic_comp::backend::render::cursor�[0m�[2m:�[0m Unable to load xcursor, using fallback cursor �[3merr�[0m�[2m=�[0mNoDefaultCursor
[2025-03-30T14:56:13Z ERROR cosmic_greeter::greeter] failed to load user data from daemon: org.freedesktop.DBus.Error.ServiceUnknown: The name com.system76.CosmicGreeter was not provided by any .service files
[2025-03-30T14:56:13Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/cosmic-greeter/.local/share/flatpak/exports/share/wayland-sessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:56:13Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/flatpak/exports/share/wayland-sessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:56:13Z WARN  cosmic_greeter::greeter] failed to read session directory "/usr/local/share/wayland-sessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:56:13Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/cosmic-greeter/.local/share/flatpak/exports/share/xsessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:56:13Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/flatpak/exports/share/xsessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:56:13Z WARN  cosmic_greeter::greeter] failed to read session directory "/usr/local/share/xsessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
�[2m2025-03-30T14:57:38.698469Z�[0m �[33m WARN�[0m �[2mcosmic_comp::logger�[0m�[2m:�[0m Failed to init journald logging. �[3merr�[0m�[2m=�[0mOs { code: 2, kind: NotFound, message: "No such file or directory" }
�[2m2025-03-30T14:57:38.704818Z�[0m �[31mERROR�[0m �[2mcosmic_comp::config�[0m�[2m:�[0m Failed to read config 'workspaces' �[3merr�[0m�[2m=�[0mNoConfigDirectory
�[2m2025-03-30T14:57:38.707263Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Period' only matched case insensitive for "period"
�[2m2025-03-30T14:57:38.707278Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Comma' only matched case insensitive for "comma"
�[2m2025-03-30T14:57:38.707282Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Period' only matched case insensitive for "period"
�[2m2025-03-30T14:57:38.707285Z�[0m �[33m WARN�[0m �[2mcosmic_settings_config::shortcuts::sym�[0m�[2m:�[0m Key-Binding 'Comma' only matched case insensitive for "comma"
�[2m2025-03-30T14:57:38.707352Z�[0m �[31mERROR�[0m �[2mcosmic_settings_config::shortcuts�[0m�[2m:�[0m shortcuts custom config error: GetKey("custom", Os { code: 2, kind: NotFound, message: "No such file or directory" })
�[2m2025-03-30T14:57:38.708190Z�[0m �[31mERROR�[0m �[2mcosmic_settings_config::window_rules�[0m�[2m:�[0m tiling exceptions custom config error: GetKey("tiling_exception_custom", Os { code: 2, kind: NotFound, message: "No such file or directory" })
�[2m2025-03-30T14:57:39.540930Z�[0m �[33m WARN�[0m �[2msmithay::backend::drm::device::fd�[0m�[2m:�[0m Unable to become drm master, assuming unprivileged mode
�[2m2025-03-30T14:57:39.962495Z�[0m �[33m WARN�[0m �[2mcosmic_comp::backend::render::cursor�[0m�[2m:�[0m Unable to load xcursor, using fallback cursor �[3merr�[0m�[2m=�[0mNoDefaultCursor
�[2m2025-03-30T14:57:40.061318Z�[0m �[33m WARN�[0m �[2mcosmic_comp::backend::render::cursor�[0m�[2m:�[0m Unable to load xcursor, using fallback cursor �[3merr�[0m�[2m=�[0mNoDefaultCursor
[2025-03-30T14:57:40Z ERROR cosmic_greeter::greeter] failed to load user data from daemon: org.freedesktop.DBus.Error.ServiceUnknown: The name com.system76.CosmicGreeter was not provided by any .service files
[2025-03-30T14:57:40Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/cosmic-greeter/.local/share/flatpak/exports/share/wayland-sessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:57:40Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/flatpak/exports/share/wayland-sessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:57:40Z WARN  cosmic_greeter::greeter] failed to read session directory "/usr/local/share/wayland-sessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:57:40Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/cosmic-greeter/.local/share/flatpak/exports/share/xsessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:57:40Z WARN  cosmic_greeter::greeter] failed to read session directory "/var/lib/flatpak/exports/share/xsessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
[2025-03-30T14:57:40Z WARN  cosmic_greeter::greeter] failed to read session directory "/usr/local/share/xsessions": Os { code: 2, kind: NotFound, message: "No such file or directory" }
�[2m2025-03-30T14:57:43.028283Z�[0m �[33m WARN�[0m �[2mcosmic_comp::backend::kms::surface�[0m�[2m:�[0m 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) �[3mname�[0m�[2m=�[0m"eDP-1"
�[2m2025-03-30T14:57:43.779704Z�[0m �[33m WARN�[0m �[2mcosmic_comp::backend::kms::surface�[0m�[2m:�[0m Failed to submit rendering: Rendering failed: The underlying drm surface encountered an error: Device is currently paused, operation rejected �[3mname�[0m�[2m=�[0m"eDP-1"

I tried DRM debug mode. Here is the full log. https://gist.github.com/vadorovsky/79ebf1230961273833cc209bd5b1f2f1

Kernel's last words, before the crash, are:

[ 1231.441373] amdgpu 0000:c5:00.0: [drm:drm_atomic_check_only] checking 00000000397a5a40
[ 1231.441421] amdgpu 0000:c5:00.0: [drm:drm_atomic_nonblocking_commit] committing 00000000397a5a40 nonblocking
[ 1231.443821] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158656, wptr 158688
[ 1231.443945] [drm:gfx_v11_0_request_gfx_index_mutex [amdgpu]] IH: CP EOP
[ 1231.444094] amdgpu 0000:c5:00.0: [drm:dm_execute_dmub_cmd_list [amdgpu]] crtc_id=0 with size 256 to 256
[ 1231.444324] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158688, wptr 158720
[ 1231.444496] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158720, wptr 158752
[ 1231.444622] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158752, wptr 158752
[ 1231.451283] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158752, wptr 158816
[ 1231.451530] amdgpu 0000:c5:00.0: [drm:drm_atomic_state_default_clear] Clearing atomic state 00000000397a5a40
[ 1231.451544] [drm:drm_mode_object_put] OBJ ID: 152 (3)
[ 1231.451553] [drm:drm_mode_object_put] OBJ ID: 158 (2)
[ 1231.451557] [drm:drm_mode_object_put] OBJ ID: 160 (2)
[ 1231.451562] [drm:drm_mode_object_put] OBJ ID: 159 (3)
[ 1231.451566] amdgpu 0000:c5:00.0: [drm:__drm_atomic_state_free] Freeing atomic state 00000000397a5a40
[ 1231.451518] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158816, wptr 158848
[ 1231.451586] amdgpu 0000:c5:00.0: [drm:drm_ioctl] comm="surface-eDP-1" pid=3827, dev=0xe200, auth=1, DRM_IOCTL_MODE_DESTROYPROPBLOB
[ 1231.451596] [drm:drm_mode_object_put] OBJ ID: 160 (2)
[ 1231.451602] [drm:drm_mode_object_put] OBJ ID: 160 (1)
[ 1231.451637] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158848, wptr 158848
[ 1231.458227] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158848, wptr 158880
[ 1231.458399] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158880, wptr 158912
[ 1231.458529] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158912, wptr 158912
[ 1231.465172] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158912, wptr 158944
[ 1231.465343] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158944, wptr 158976
[ 1231.465473] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158976, wptr 158976
[ 1231.472116] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 158976, wptr 159008
[ 1231.472288] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 159008, wptr 159040
[ 1231.472417] [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 159040, wptr 159040

So it looks like maybe the last ioctl causes smithay/cosmic to crash, but all ioctl logs look very similar to me.

I was able to use SDDM+KDE on the same laptop without such issues.

[vadorovsky]

I managed to get Fedora with the same version of COSMIC working, so I'm closing this discussion - the problem on Gentoo system must be triggered by kernel or mesa, not by smithay.