[Bug 103317] Tearing in WQHD, but not in FHD

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103317

            Bug ID: 103317
           Summary: Tearing in WQHD, but not in FHD
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: torkes94 at gmail.com

Created attachment 134888
  --> https://bugs.freedesktop.org/attachment.cgi?id=134888&action=edit
X server log

Hi all,

I'm using Arch Linux with kernel 4.13.5-1-ARCH, Xorg 1.19.5 and the amdgpu
driver, version 1.4. My GPU is a R9 390. I attached the X server log.
My window manager is i3.

Entries in xorg.conf.d:

20-amdgpu.conf

Section "Device"
        Identifier "AMD R9 390"
        Driver "amdgpu"
        Option "DRI" "3"
        Option "TearFree" "true"
EndSection

With this setup I experience screen tearing and flickering on a WQHD monitor.
Enabling a compositor like compton makes these effects worse.
I can reproduce this issue on the same machine with KDE instead of i3.
To give you an idea of my problem, I captured a scene from the RTS 0ad:

https://youtu.be/ZhjPpB7djyk

The same kind of flickering and tearing also happens in desktop mode. It seems
to appear randomly.
However, the problem disappears when I'm using the radeonsi driver or changing
the resolution to FHD. In both cases everything is fine.

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