[Bug 198745] New: Blank screen on RX 580 with AMDGPU Display Core enabled

[Bug 198745] New: Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

            Bug ID: 198745
           Summary: Blank screen on RX 580 with AMDGPU Display Core
                    enabled
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.15.2
          Hardware: Other
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: kyle.devir@mykolab.com
        Regression: No

Created attachment 274089
  --> https://bugzilla.kernel.org/attachment.cgi?id=274089&action=edit
journalctl output for amdgpu

When enabling AMDGPU Display Core for my Gigabyte RX 580, I get nothing more
than a blank screen on my HDMI monitor.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #1 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Created attachment 274091
  --> https://bugzilla.kernel.org/attachment.cgi?id=274091&action=edit
journalctl output for drm

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

Kyle De'Vir (kyle.devir@mykolab.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kyle.devir@mykolab.com

--- Comment #2 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Comment on attachment 274091
  --> https://bugzilla.kernel.org/attachment.cgi?id=274091
journalctl output for drm

> Feb 10 17:33:47 valmar-desktop kernel: [drm] Cannot find any crtc or sizes

This is the only error from the log.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #3 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Is there anything I can do to get any interest debug output?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

Alex Deucher (alexdeucher@gmail.com) changed:

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

--- Comment #4 from Alex Deucher (alexdeucher@gmail.com) ---
Please attach your full dmesg output and xorg log if you are using X.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #5 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Created attachment 274115
  --> https://bugzilla.kernel.org/attachment.cgi?id=274115&action=edit
dmesg log

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #6 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Created attachment 274117
  --> https://bugzilla.kernel.org/attachment.cgi?id=274117&action=edit
xorg log

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

Harry Wentland (harry.wentland@amd.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com

--- Comment #7 from Harry Wentland (harry.wentland@amd.com) ---
Please capture dmesg again with amdgpu.dc_log=1 and drm.debug=6 kernel options.

What monitor are you using? Is it connected via a dongle?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #8 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Created attachment 274131
  --> https://bugzilla.kernel.org/attachment.cgi?id=274131&action=edit
dmesg log with amdgpu.dc_log=1 and drm.debug=6

My monitor is an AOC I2379VHE. It's attached via a HDMI cable.

What do you mean by dongle? Wifi?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #9 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to Kyle De'Vir from comment #8)
> What do you mean by dongle? Wifi?

A display dongle (e.g., DP to HDMI adapter).

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #10 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Ah. None ~ just your average HDMI to HDMI cable.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #11 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Any progress on this issue? Are there any other logs or debugging output that I
might be able to supply to help with this issue? If so, how do I acquire them?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #12 from Harry Wentland (harry.wentland@amd.com) ---
It looks like we detect no display. We haven't yet had a chance to repro the
problem. I'll see if I can find this display in the office.

It'd be difficult debugging this remotely but if I can't repro this I might
send you some extra logging patches in the hopes of getting more info.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #13 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Is there something that plain AMDGPU is doing that Display Core isn't, perhaps?
Is there a way to find what the difference could be?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #14 from Harry Wentland (harry.wentland@amd.com) ---
Created attachment 274477
  --> https://bugzilla.kernel.org/attachment.cgi?id=274477&action=edit
[PATCH] drm/amd/display: Disable HPD filter for HDMI

This is a bit of a shot in the dark but I'm curious if HPD filtering causes us
to lose the HPD signal for some reason.

Do you have a chance to try this patch and see if it fixes the issue?

Note: This patch is really only for debug purposes and might lead to other
instability with display detection.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #15 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Am trying it out soon. Will try and capture dmesg log if it matters.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #16 from Kyle De'Vir (kyle.devir@mykolab.com) ---
No change... dmesg looks no different. :/

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #17 from Harry Wentland (harry.wentland@amd.com) ---
Thanks for checking. Non-DC display driver and DC do detection somewhat
differently. It's somewhat difficult to say what's going wrong there.

Do you see different behavior when booting headless, then plugging in the
display?

If you're interested in debugging I'd probably use ftrace to get started,
checking that the functions get hit:
- handle_hpd_irq (only on hotplug)
- dc_link_detect (crucial to detection)
- dc_sink_create
- dm_helpers_read_local_edid
- drm_get_edid
- dm_helpers_parse_edid_caps
- amdgpu_dm_update_connector_after_detect
- drm_mode_connector_update_edid_property

Script to do ftrace debugging (run as root):

#!/bin/bash
cd /sys/kernel/debug/tracing/

echo handle_hpd_irq >> set_ftrace_filter
echo dc_link_detect >> set_ftrace_filter
echo dc_sink_create >> set_ftrace_filter
echo dm_helpers_read_local_edid >> set_ftrace_filter
echo drm_get_edid >> set_ftrace_filter
echo dm_helpers_parse_edid_caps >> set_ftrace_filter
echo amdgpu_dm_update_connector_after_detect >> set_ftrace_filter
echo drm_mode_connector_update_edid_property >> set_ftrace_filter

echo function_graph >> current_tracer
echo '' >> trace
cat trace_pipe

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #18 from Kyle De'Vir (kyle.devir@mykolab.com) ---
Actually, there was a change! Didn't have to boot headless at all, happily.

Your patch didn't seem to change anything, but the update to 4.15.6 might have
done something...? Did anything change for Display Core in the latest stable
update?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #19 from Harry Wentland (harry.wentland@amd.com) ---
I don't see any DC or other DRM change in the stable kernel between 4.15.5 and
4.15.6.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #20 from Kyle De'Vir (kyle.devir@mykolab.com) ---
I'm going to test without your patch to see if the problem pops up again.

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

--- Comment #21 from Kyle De'Vir (kyle.devir@mykolab.com) ---
> I don't see any DC or other DRM change in the stable kernel between 4.15.5
> and 4.15.6.

What about any of the other point releases? I tried without your patch, and
amdgpu.dc=1 mysteriously just works... so strange that it just didn't before.

I don't understand what even happened, and that's even more frustrating than it
not working... urgh. :/

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

Kyle De'Vir (kyle.devir@mykolab.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |UNREPRODUCIBLE

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

Claude Heiland-Allen (claude@mathr.co.uk) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |claude@mathr.co.uk

--- Comment #22 from Claude Heiland-Allen (claude@mathr.co.uk) ---
I think I have this exact same issue with my RX 580.  When amdgpu.dc=1 is
initialized at boot, the console goes blank as it thinks all displays are
disconnected.  Xorg is not able to enable the display either.  With amdgpu.dc=0
all is fine.  Tried with various (mostly Debian) kernels from 4.16 through
4.18~rc4, all have the issue.  I'm building a 4.18~rc7 from kernel.org now to
rule out Debian patches being the issue and will be able to provide logs.

Should I open a new issue as this one has been closed?  Or can this one be
reopened?

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[Bug 198745] Blank screen on RX 580 with AMDGPU Display Core enabled

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198745

Nicholas Kazlauskas (nicholas.kazlauskas@amd.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nicholas.kazlauskas@amd.com

--- Comment #23 from Nicholas Kazlauskas (nicholas.kazlauskas@amd.com) ---
(In reply to Claude Heiland-Allen from comment #22)
> I think I have this exact same issue with my RX 580.  When amdgpu.dc=1 is
> initialized at boot, the console goes blank as it thinks all displays are
> disconnected.  Xorg is not able to enable the display either.  With
> amdgpu.dc=0 all is fine.  Tried with various (mostly Debian) kernels from
> 4.16 through 4.18~rc4, all have the issue.  I'm building a 4.18~rc7 from
> kernel.org now to rule out Debian patches being the issue and will be able
> to provide logs.
> 
> Should I open a new issue as this one has been closed?  Or can this one be
> reopened?

Feel free to create a new ticket and include your dmesg and Xorg logs.

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