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

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

[bugzilla-daemon]

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

            Bug ID: 207901
           Summary: Nouveau: In a 4 monitor setup, 1-2 displays remains
                    black after boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.3.0-51
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mauricegale1@gmail.com
        Regression: No

Created attachment 289307
  --> https://bugzilla.kernel.org/attachment.cgi?id=289307&action=edit
Stack Trace that occurs when issue arises

When four displays are connected to a gpu (NVIDIA p2000), 2 of the 4 displays
will remain black. The monitors that remain black are the same exact ones on
each boot. The connectors for the respective monitors are
displayport->miniDisplayport, and displayport->hdmi. This issue was also
identified during install time of Ubuntu.

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

[bugzilla-daemon]

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

--- Comment #1 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289311
  --> https://bugzilla.kernel.org/attachment.cgi?id=289311&action=edit
Log file with drm debugging enabled

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

[bugzilla-daemon]

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

--- Comment #2 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289313
  --> https://bugzilla.kernel.org/attachment.cgi?id=289313&action=edit
PCI Information

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

[bugzilla-daemon]

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

--- Comment #3 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289315
  --> https://bugzilla.kernel.org/attachment.cgi?id=289315&action=edit
Config File

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

[bugzilla-daemon]

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

--- Comment #4 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289317
  --> https://bugzilla.kernel.org/attachment.cgi?id=289317&action=edit
CPU Information

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

[bugzilla-daemon]

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

Ilia Mirkin (imirkin@alum.mit.edu) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imirkin@alum.mit.edu

--- Comment #5 from Ilia Mirkin (imirkin@alum.mit.edu) ---
Does this continue to occur on recent kernels? e.g. 5.6 or 5.7-rc?

It looks like aux port 9 is stuck somehow, not 100% sure that's something
that'd have been addressed, but DP stuff definitely got improvements.

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

[bugzilla-daemon]

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

--- Comment #6 from Maurice Gale (mauricegale1@gmail.com) ---
(In reply to Ilia Mirkin from comment #5)
> Does this continue to occur on recent kernels? e.g. 5.6 or 5.7-rc?
> 
> It looks like aux port 9 is stuck somehow, not 100% sure that's something
> that'd have been addressed, but DP stuff definitely got improvements.

I will install install 5.7 to give that a shot, Thanks!

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

[bugzilla-daemon]

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

--- Comment #7 from Maurice Gale (mauricegale1@gmail.com) ---
Interestingly, after installing both 5.6 and 5.7-rc, I get no displays at all
when connected to my Nvidia p2000. 

However, when I use integrated graphics, I get both of the displays. It seems
as though things have gotten worse.

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

[bugzilla-daemon]

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

--- Comment #8 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289347
  --> https://bugzilla.kernel.org/attachment.cgi?id=289347&action=edit
Log for 5.6

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

[bugzilla-daemon]

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

--- Comment #9 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289349
  --> https://bugzilla.kernel.org/attachment.cgi?id=289349&action=edit
Log for 5.7

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

[bugzilla-daemon]

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

--- Comment #10 from Ilia Mirkin (imirkin@alum.mit.edu) ---
It looks like you don't have firmware present, which starting with v5.6 fails
the whole module load. (I believe that's a separate bug.)

Try installing linux-firmware, and making the firmware available in
/lib/firmware at nouveau module load time (so if it's loaded from initrd, it
needs to be in initrd).

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

[bugzilla-daemon]

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

--- Comment #11 from Maurice Gale (mauricegale1@gmail.com) ---
Ok, I installed the firmware. Now I have 2/4 displays.

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

[bugzilla-daemon]

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

--- Comment #12 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289357
  --> https://bugzilla.kernel.org/attachment.cgi?id=289357&action=edit
Log after firmware installation

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

[bugzilla-daemon]

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

--- Comment #13 from Ilia Mirkin (imirkin@alum.mit.edu) ---
OK, that looks roughly identical to your v5.3 situation.

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

[bugzilla-daemon]

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

Lyude Paul (thatslyude@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thatslyude@gmail.com

--- Comment #14 from Lyude Paul (thatslyude@gmail.com) ---
Hi! I was wondering if you could give this a try with the closed source nvidia
driver and see if your displays work there? I mainly ask because I'm suspicious
that the stuck i2c aux channel we're seeing might just be throwing some status
we don't handle correctly in nouveau, and I'd also like to make sure there
isn't something strange going on with the monitors here.

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

[bugzilla-daemon]

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

--- Comment #15 from Maurice Gale (mauricegale1@gmail.com) ---
Hi! I have installed the closed source nvidia driver(nvidia-driver-440), and I
am able to successfully get every display on every single boot.

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

[bugzilla-daemon]

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

--- Comment #16 from Lyude Paul (lyude@redhat.com) ---
(In reply to Maurice Gale from comment #15)
> Hi! I have installed the closed source nvidia driver(nvidia-driver-440), and
> I am able to successfully get every display on every single boot.

Cool-so we at least should be able to trace the nvidia blob to figure out
what's going on. Do you think you could grab an mmiotrace of the nvidia blob
with all of your displays hooked up?

https://wiki.ubuntu.com/X/MMIOTracing

You might also need to add:

iomem=relaxed

To get that working. fwiw as well, that guide says somewhere to stop X
afterwards before stopping the trace. That may or may not work, and it should
be fine if you just leave X running when stopping the trace instead.

For submitting the mmiotrace to me, it's probably going to be somewhat large so
I would recommend compressing it with xz and just sending it directly to my
email.

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

[bugzilla-daemon]

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

--- Comment #17 from Lyude Paul (lyude@redhat.com) ---
(got the mmiotrace via email, thanks!)

Also another update on this: we actually got some feedback from nvidia
regarding this issue and I think we have a pretty good idea of what's
happening, so I should have some patches for you to try soon

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

[bugzilla-daemon]

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

--- Comment #18 from Maurice Gale (mauricegale1@gmail.com) ---
That's awesome. Thanks!

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

[bugzilla-daemon]

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

--- Comment #19 from Lyude Paul (lyude@redhat.com) ---
Hi! Ben Skeggs pushed a fix for this to their kernel repository:

https://github.com/skeggsb/nouveau/commit/2b9345f98be41e2145f561f6cfecc99686f4ef71.patch

You should be able to apply it (you will need to pass --directory=drivers/gpu/
to git am for it to apply), would you mind testing this and letting me know if
it fixes your issue?

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

[bugzilla-daemon]

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

--- Comment #20 from Maurice Gale (mauricegale1@gmail.com) ---
Hi,

I tried the patch, but I am still missing two displays. I have attached the new
log.

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

[bugzilla-daemon]

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

--- Comment #21 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 289887
  --> https://bugzilla.kernel.org/attachment.cgi?id=289887&action=edit
Log after Nouveau Patch

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

[bugzilla-daemon]

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

--- Comment #22 from Lyude Paul (lyude@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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[Bug 207901] Nouveau: In a 4 monitor setup, 1-2 displays remains black after boot

[bugzilla-daemon]

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

--- Comment #23 from Maurice Gale (mauricegale1@gmail.com) ---
Hi!

Here's my environment:

Monitor:
 - dell p4317q (Quad display Monitor)
 - Aside from the above, I have also tested on 4 separate monitors.

Connectors:
 - Display -> HDMI (Brand: Ivanky)
 - Display -> HDMI (Brand: Ivanky)
 - Display -> Mini Display (Brand: Ivanky)
 - Display -> Display (Brand: Ivanky)

Desktop:
 - Dell Optiplex Xe3

- No laptops or special adaptors are used

Link to connectors:
https://www.amazon.com/gp/product/B076RMR48C/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

I have attached the new log with suggested boot options (116-drm-log.txt)
Please let me know if there is anything else that you need.

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

[bugzilla-daemon]

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

--- Comment #24 from Maurice Gale (mauricegale1@gmail.com) ---
Created attachment 290253
  --> https://bugzilla.kernel.org/attachment.cgi?id=290253&action=edit
New log with drm 116

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

[bugzilla-daemon]

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

--- Comment #25 from Lyude Paul (lyude@redhat.com) ---
Hi! could you please retry this with a kernel from drm-tip? I don't see any
DisplayPort/DP MST debugging output there, so I'm guessing you either forgot to
add drm.debug=0x116 or your kernel (which appears to be based off the ubuntu
kernel) is too old to support that. As well, I can see a couple of other bugs
from nouveau in that log which have already been fixed in more recent kernels.

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

[bugzilla-daemon]

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

--- Comment #26 from Maurice Gale (mauricegale1@gmail.com) ---
Sorry for the delay and the mistake. It loaded the 5.3 kernel by default. I
recreated the log using 5.7-rc5 with the i2c timeout patch. I also added the
new grub options. The file size is much larger than the old one, so it should
be correct this time.

I noticed that I have more luck getting all monitors displayed when I do not
have the Display->MiniDisplay connected (Swap it out for Display->HDMI). It
seems as though mini display is causing some issues.

Again, thank you so much for your help, and please let me know if you need
anything else.

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

[bugzilla-daemon]

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

--- Comment #27 from Ilia Mirkin (imirkin@alum.mit.edu) ---
DP -> HDMI is, most likely, just passive, so the displays are being driven as
HDMI rather than as DP. DP is the problematic protocol...

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

[bugzilla-daemon]

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

--- Comment #28 from Lyude Paul (lyude@redhat.com) ---
(In reply to Ilia Mirkin from comment #27)
> DP -> HDMI is, most likely, just passive, so the displays are being driven
> as HDMI rather than as DP. DP is the problematic protocol...

Hi-so, my first guess then might actually be a bad DP adapter. In my experience
DP cables (usually the full-size ones, but I've had it happen with one or two
passive adapters as well) have a bad habit of breaking really easily. One time
I actually spent a week trying to fix a bug that'd I'd already tried
troubleshooting by replacing the DP cable, only to eventually find out the
cable I replaced it with also magically went bad.

Mind posting one more log with the same parameters as last time? I probably
can't tell for sure but usually you'll see a lot of link training failures or
timeouts when the cable has gone bad (but sometimes the symptoms are a lot more
sinister...). As well, I'd also try another adapter of course.

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

[bugzilla-daemon]

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

--- Comment #29 from Maurice Gale (mauricegale1@gmail.com) ---
I can try to replace the DP cable to see if that does the trick--DP adapters
seems to be so finicky. I would still be curious as to why it works with nvidia
drivers, however. 

I have emailed an additional log. I really appreciate your help. After getting
a new DP adapter, I will update you on whether it worked or not, as well as
give you an additional log.

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

[bugzilla-daemon]

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

--- Comment #30 from Lyude Paul (lyude@redhat.com) ---
Hi! Sorry for the long wait, I got distracted with some other work that needed
to be done. Also, sorry for making you buy that adapter since it looks like
things aren't working still. So I took a look at the logs that you gave me and
noticed some interesting things that didn't catch my eye before. In the last
log you gave me with the new DP adapter I can't see nouveau noticing any of the
monitors. On the log before that though, I actually see it detect all four
monitors. I also see it actually turn all four on successfully, huh.

The other thing I noticed is that it looks like you're using the nouveau DDX in
your X config. That makes me wonder, do the screens come up -at all- during the
boot process before the GUI comes up? As well, have you tried the modesetting
DDX to see if that makes any difference, or perhaps wayland?

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

[bugzilla-daemon]

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

--- Comment #31 from Maurice Gale (mauricegale1@gmail.com) ---
Sorry for the late reply, I too was working a different project.

To answer the above questions:

1. Only the main screen is displayed during grub, the other are displayed once
Ubuntu finish loading.

2. I have tried modesetting DDX, but got the same results.

3. I have also tried wayland, but got the same results.

I have also tried starting off with 1 display, then 2 and so on. I have noticed
that it can consistently load 3 displays. The trouble seems to occur once the
4th display is introduced.

I also get the occasional all displays booting black when 4 displays are
connected.

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