[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

            Bug ID: 110217
           Summary: RX580: screen turns black or flickers until forced
                    reconfiguration
           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: numzer0@yandex.ru

Created attachment 143754
  --> https://bugs.freedesktop.org/attachment.cgi?id=143754&action=edit
dmesg output

I have a Radeon RX560 and VGA monitor (with broken EDID) connected via a cheap
HDMI-to-VGA converter (with its own broken EDID).

The system starts up normally. During boot up, it should change display
resolution as specified in the kernel command line (`video=1280x1024-32@75`,
monitor native). Screen turns black instead, and resolution remains unchanged.
But after I plug HDMI out and in, the monitor gets new resolution and shows
console login prompt, as expected. (X isn’t configured to start at bootup).

Then, when I `startx`, it chooses the same resolution but wrong frequency (85
Hz, too much for my monitor). That’s probably due to converter supplying the
EDID. After I run `xrandr --rate 75`, it switches to the correct mode.

I wouldn’t even mention such small nuisance, but if I specify exactly the same
mode (as reported by `xrandr --verbose`) explicitly (as a `Modeline`), it works
but flickers, despite the `TearFree` option enabled. Moreover, when the monitor
is turned off and then on, it wakes up in the same mode *but flickers.*
Changing mode back and forth (`xrandr --output HDMI-A-0 --preferred ; xrandr
--rate 75`) helps.

I usually have `compton` running. Without it, flicker is tolerable but still
present.

OS: Arch Linux
Kernel: Linux 5.0.1-arch1-1-ARCH
X driver: xf86-video-amdgpu 19.0.0-1

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

--- Comment #1 from numzer0@yandex.ru ---
Created attachment 143755
  --> https://bugs.freedesktop.org/attachment.cgi?id=143755&action=edit
Xorg log

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

--- Comment #2 from numzer0@yandex.ru ---
Created attachment 143756
  --> https://bugs.freedesktop.org/attachment.cgi?id=143756&action=edit
Xorg config

If I uncomment the proper `Output-...` option, Xorg starts in the correct mode
but with flicker. That’s true both for `amdgpu` and `modesetting` drivers IIRC.

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
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 Attachment #143754|text/x-log                  |text/plain
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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
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 Attachment #143755|text/x-log                  |text/plain
          mime type|                            |

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

--- Comment #3 from numzer0@yandex.ru ---
New information:

1. Screen turns black at module insertion, be it during bootup or later. But
resuming from hibernation works.

2. On the system, the converter I use is problematic itself. When I connect it
to another PC, HDMI port is shown as “connected” *until* I connect a monitor to
the converter. Then, everything works but HDMI port is displayed as
“disconnected” in xrandr.

After updating the system, flicker seems to happen in X only, despite the
“TearFree” option. Virtual consoles work well, albeit use the same mode (i.e.
no mode change on VT switch). Not sure was that the case earlier.

Also, after last hibernation, the old trick with resetting mode didn’t help,
flicker continues. New X instances flicker as well. 

New kernel: Linux 5.1.2-arch1-1-ARCH
New X driver: xf86-video-amdgpu 19.0.1-1

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

--- Comment #4 from numzer0@yandex.ru ---
Just downgraded xf86-video-amdgpu back to 19.0.0-1. The flicker disappeared.

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

--- Comment #5 from numzer0@yandex.ru ---
The flicker seems to be due to
https://bugs.freedesktop.org/show_bug.cgi?id=102646, despite the fact Arch wiki
tells that affects 120+ Hz only (my monitor runs at 75 Hz). At least fixing
clocks fixes the problem.

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[Bug 110217] RX580: screen turns black or flickers until forced reconfiguration

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https://bugs.freedesktop.org/show_bug.cgi?id=110217

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

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

--- Comment #6 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/733.

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