[Bug 196125] New: [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[Bug 196125] New: [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

            Bug ID: 196125
           Summary: [Regression] AMD Radeon RX 480 flickering on HDMI port
                    with Linux 4.11.4
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.11.4
          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: contact@florentflament.com
        Regression: No

Using a Sapphire AMD Radeon RX 480 Graphic Card with the amdgpu driver. Since a
Linux Kernel upgrade from 4.10.6 to 4.11.4, I'm experiencing screen flickering
(full black or white screen blinking) when the picture on the screen in
changing (video, moving windows). There is no flickering when displaying a
static picture. The flickering occurs when the screen (with a DVI connector) is
connected to the Graphic Card's HDMI port. There is no flickering when the
screen is plugged to one of the Radeon's Display ports (with a HDMI to Display
port adapter). This flickering didn't occur with Kernel 4.10.6.

$ cat /etc/fedora-release 
Fedora release 25 (Twenty Five)

$ uname -a
Linux amn 4.11.4-200.fc25.x86_64 #1 SMP Wed Jun 7 18:28:00 UTC 2017 x86_64
x86_64 x86_64 GNU/Linux

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

Alex Deucher (alexdeucher@gmail.com) changed:

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

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Can you bisect?  Please attach your xorg log and dmesg output.

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

--- Comment #2 from contact@florentflament.com ---
Created attachment 257079
  --> https://bugzilla.kernel.org/attachment.cgi?id=257079&action=edit
dmesg output

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

--- Comment #3 from contact@florentflament.com ---
I just figured out that the flickering occurs only when logging using Wayland.
When using xorg, there is no flickering (I attached xorg log files in case it
may be useful). I'll attach Wayland log files as soon as I find them (please
point me to them if you know where they are). And I'll try to bisect soon.

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

--- Comment #4 from contact@florentflament.com ---
Created attachment 257081
  --> https://bugzilla.kernel.org/attachment.cgi?id=257081&action=edit
Xorg log file

Please note that the flickering doesn't occur when using xorg.
This file is just there to provide additional information.

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

Peter Spiess-Knafl (psk@autistici.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |psk@autistici.org

--- Comment #5 from Peter Spiess-Knafl (psk@autistici.org) ---
I can confirm this behaviour.

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

--- Comment #6 from Peter Spiess-Knafl (psk@autistici.org) ---
Forgot to mention that I am using the displayport connector. So it does not
only affect HDMI.

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[Bug 196125] [Regression] AMD Radeon RX 480 flickering on HDMI port with Linux 4.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=196125

--- Comment #7 from contact@florentflament.com ---
I haven't experienced any flickering for a while (be it with Wayland or Xorg,
one monitor connected to a HDMI port and one another to a DisplayPort). This
seems to have been fixed.

$ cat /etc/fedora-release 
Fedora release 26 (Twenty Six)
$ uname -a
Linux amn 4.13.5-200.fc26.x86_64 #1 SMP Thu Oct 5 16:53:13 UTC 2017 x86_64
x86_64 x86_64 GNU/Linux

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