6.15-rc6/regression/bisected - after commit f1c6be3999d2 error appeared: *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error

[Mikhail Gavrilov]

On Fri, May 30, 2025 at 6:48 PM Pillai, Aurabindo
<Aurabindo.Pillai at amd.com> wrote:
>
> [AMD Official Use Only - AMD Internal Distribution Only]
>
>
> Hi Mike,
>
> We were trying to see if we can repro the issue on newer cards as well, but it seems only 6000 series can repro at our end.
> If you can repro more easily on other cards, please add "drm.debug=0x116 log_buf_len=20M" to your kernel cmdline and grab the dmesg please.

Hi Aurabindo,

With drm.debug=0x116, I was able to capture the DMCUB error on the
7900XTX even during system boot.
Here’s a snippet from the log:

[  140.307960] amdgpu 0000:03:00.0: [drm:drm_atomic_state_init]
Allocated atomic state 000000003bcb4982
[  140.307978] amdgpu 0000:03:00.0: [drm:drm_atomic_get_plane_state]
Added [PLANE:77:plane-6] 00000000d20ccca3 state to 000000003bcb4982
[  140.307985] amdgpu 0000:03:00.0: [drm:drm_atomic_get_crtc_state]
Added [CRTC:80:crtc-0] 00000000267a47e8 state to 000000003bcb4982
[  140.307992] amdgpu 0000:03:00.0: [drm:drm_atomic_set_fb_for_plane]
Set [FB:132] for [PLANE:77:plane-6] state 00000000d20ccca3
[  140.308214] amdgpu 0000:03:00.0: [drm:drm_mode_addfb2] [FB:134]
[  140.506110] amdgpu 0000:03:00.0: [drm:dc_dmub_srv_wait_for_idle
[amdgpu]] No reply for DMUB command: status=3
[  140.506572] amdgpu 0000:03:00.0: [drm] *ERROR*
dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic
data
[  140.506605] amdgpu 0000:03:00.0:
[drm:dc_dmub_srv_log_diagnostic_data [amdgpu]] DMCUB STATE:
[  140.507065] amdgpu 0000:03:00.0:
[drm:dc_dmub_srv_log_diagnostic_data [amdgpu]]     dmcub_version
: 07002d00
[  140.507500] amdgpu 0000:03:00.0:
[drm:dc_dmub_srv_log_diagnostic_data [amdgpu]]     scratch  [0]
: 00000003
[  140.507924] amdgpu 0000:03:00.0:
[drm:dc_dmub_srv_log_diagnostic_data [amdgpu]]     scratch  [1]
: 07002d00
[  140.508341] amdgpu 0000:03:00.0:
[drm:dc_dmub_srv_log_diagnostic_data [amdgpu]]     scratch  [2]
: 00000000
[  140.508591] amdgpu 0000:03:00.0: [drm:dc_dmub_srv_wait_for_idle
[amdgpu]] No reply for DMUB command: status=3
[  140.508944] amdgpu 0000:03:00.0: [drm] *ERROR*
dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic
data

>
> I'd also like to know if your issue is fully resolved if "drm/amd/display: more liberal vmin/vmax update for freesync" is reverted.

Yes, the issue was fully resolved by reverting commit f1c6be3999d2.

I’ve attached the full kernel log below.

-- 
Best Regards,
Mike Gavrilov.
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