[Bug 201139] New: amdgpu: [drm] enabling link 1 failed: 15 (vega)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201139

            Bug ID: 201139
           Summary: amdgpu: [drm] enabling link 1 failed: 15 (vega)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19-rc3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mezin.alexander at gmail.com
        Regression: No

My setup:
- RX Vega 64
- Arch Linux
- GNOME 3.28.3 on Xorg 1.20.1
- modesetting Xorg driver
- LG 27UD69P and Dell P2415Q

I have "screen blanking" enabled in Gnome. Sometimes (very rarely) one display
(Dell, connected to 2nd DisplayPort) doesn't wake up correctly. It turns on,
shows only black screen, then quickly shows "no signal" message. In kernel log
I see:

[39215.008773] [drm] enabling link 1 failed: 15

If I manually turn the display off and on, it starts to work.

Can't tell if it is a regression (hardly it is) because on 4.18 and earlier
screen blanking just makes the driver hang:
https://bugzilla.kernel.org/show_bug.cgi?id=200531

I've never seen a similar issue on Windows on the same machine.
If I'm not mistaken, I've seen the same issue with Gnome on Wayland too (but
I'm not sure).

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