[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

            Bug ID: 104300
           Summary: Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has
                    trouble waking up displays after suspend
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: toni.spets@iki.fi
                CC: mariusz.g.mazur@gmail.com
                CC: mariusz.g.mazur@gmail.com

When resuming from suspend on 4.15-rc2 the DC stack *usually* wakes up displays
after some waiting on this Polaris card compared to non-DC code which flips
them on instantly.

I've encountered the following issues with my dual head setup (native DVI and
HDMI->DVI adapter):

 - it takes long (2-5 seconds) for the outputs to come up
 - Xfce thinks both of the display were hotplugged causing all kinds of
desktop/windowing related issues
 - sometimes corrupted image on both outputs and the outputs are reset after
waiting for 20 seconds or so, sometimes they come up, sometimes the corruption
stays, the system is unresponsive to input while that's going on

I have zero issues without DC. Waking up works 100% of the time and Xfce never
thinks the displays were hotplugged.

Currently I have no logs from kernel from that time. Hope this description is
enough.

--- Comment #1 from Mariusz Mazur <mariusz.g.mazur@gmail.com> ---
I'm reliably getting monitors waking up be treated as hotplugged on ubuntu
18.04's 4.15 kernels and a build of 4.16.7. More info:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1770836

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

--- Comment #2 from Harry Wentland <harry.wentland@amd.com> ---
Toni, would you be able to post your dmesg log when this happens?

It looks like in Mariusz's case the DP monitor somehow reports as disconnected
when we resume. I wonder if there are issues in our DP enable sequence.

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

--- Comment #3 from Toni Spets <toni.spets@iki.fi> ---
Created attachment 140414
  --> https://bugs.freedesktop.org/attachment.cgi?id=140414&action=edit
dmesg of a boot with one suspend cycle

This dmesg contains a suspend immediately after the system was booted up. After
resuming both displays lit up and showed the last image before the system was
suspended. The system was completely unresponsible for a while.

Once it was working I had the Xfce hotplug window open and I clicked the extend
button which again got the system stuck for the same amount of time. The
displays were already correctly arranged so it was unneeded but it also
triggered the issue.

As a bonus xrandr shows three outputs connected when I have only two. I'll
attach output of both (DC and non-DC).

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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--- Comment #4 from Toni Spets <toni.spets@iki.fi> ---
Created attachment 140415
  --> https://bugs.freedesktop.org/attachment.cgi?id=140415&action=edit
xrandr output with DC off

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

--- Comment #5 from Toni Spets <toni.spets@iki.fi> ---
Created attachment 140416
  --> https://bugs.freedesktop.org/attachment.cgi?id=140416&action=edit
xrandr output with DC on

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

--- Comment #6 from Mariusz Mazur <mariusz.g.mazur@gmail.com> ---
I found it! Before I knew 4.14 worked fine and 4.15+ introduced this bug.

Now I know precisely which patches:
- 4.14.35 works correctly
- 4.14.36 exhibits this behavior

There are only a few amdgpu patches in there, one by Bas Nieuwenhuizen
@chromium and a few by Alex Deucher @amd. Now I need to figure out how to set
up a kernel-building env and test which patch in particular is the one that
breaks everything.

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

--- Comment #7 from Mariusz Mazur <mariusz.g.mazur@gmail.com> ---
Argh, the failures are inconsistent. Serves me right for jumping the gun…

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

--- Comment #8 from Mariusz Mazur <mariusz.g.mazur@gmail.com> ---
Ok, I've managed to narrow down my issue to displayport link training code
somehow triggering a monitor disconnect while attempting to wake it up. So my
issue is completely unrelated, none of my comments here apply, please ignore
(no way to delete them unfortunately).

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[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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https://bugs.freedesktop.org/show_bug.cgi?id=104300

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #9 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/278.

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