[Bug 207901] Nouveau: In a 4 monitor setup, 1-2 displays remains black after boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207901

--- Comment #22 from Lyude Paul (lyude at redhat.com) ---
Hi! Sorry this took me a little bit to reply to. So-it looks like we did indeed
fix the i2c timeout issue that I was seeing on your board, so the next
suspicious thing in your log seems to be the fact one of your DP ports (DP-7 in
particular) appears to think it's being continuously hotplugged:

[   90.996867] nouveau 0000:01:00.0: DRM: unplugged DP-7
[   91.191704] [drm:drm_add_display_info [drm]] non_desktop set to 0
[   91.191711] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 300000 kHz
[   91.297638] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries,
giving up. First error: -110
[   91.297642] [drm:drm_helper_hpd_irq_event [drm_kms_helper]]
[CONNECTOR:73:DP-4] status updated from connected to connected
[   91.493173] [drm:drm_add_display_info [drm]] non_desktop set to 0
[   91.493179] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 300000 kHz
[   91.599120] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries,
giving up. First error: -110
[   91.599123] [drm:drm_helper_hpd_irq_event [drm_kms_helper]]
[CONNECTOR:76:DP-5] status updated from connected to connected
[   91.599335] nouveau 0000:01:00.0: DRM: display: 4x540000 dpcd 0x12
[   91.599336] nouveau 0000:01:00.0: DRM: encoder: 4x810000
[   91.599336] nouveau 0000:01:00.0: DRM: maximum: 4x540000
[   91.605980] [drm:drm_add_display_info [drm]] non_desktop set to 0
[   91.605986] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 0 kHz
[   91.606300] [drm:drm_helper_hpd_irq_event [drm_kms_helper]]
[CONNECTOR:79:DP-6] status updated from connected to connected
[   91.606518] nouveau 0000:01:00.0: DRM: display: 4x540000 dpcd 0x12
[   91.606519] nouveau 0000:01:00.0: DRM: encoder: 4x810000
[   91.606519] nouveau 0000:01:00.0: DRM: maximum: 4x540000
[   91.613389] [drm:drm_add_display_info [drm]] non_desktop set to 0
[   91.613394] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS
clock 0 kHz
[   91.613722] [drm:drm_helper_hpd_irq_event [drm_kms_helper]]
[CONNECTOR:82:DP-7] status updated from connected to connected
[   91.614016] nouveau 0000:01:00.0: DRM: plugged DP-7

What kind of setup do you have your monitors hooked up through? Are they on any
laptop docks/standalone MST hubs, do they go through any video adaptors, what
models/brands and what kind of connectors do they use, etc.

As well, do you think you can grab another log from your system but using:

log_buf_len=50M drm.debug=0x116 nouveau.debug=disp=trace

(include the full log from your boot if you can and don't trim it, since it's
likely going to be a big log)

I have a feeling one of your MST devices is doing some weird out-of-spec
behavior that we might need to teach nouveau to handle

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