[Bug 107053] Flicker/tearing on MacBook Pro 11.5 Ubuntu 18.04

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107053

            Bug ID: 107053
           Summary: Flicker/tearing on MacBook Pro 11.5 Ubuntu 18.04
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: cen.is.imba at gmail.com

Created attachment 140366
  --> https://bugs.freedesktop.org/attachment.cgi?id=140366&action=edit
xorg log

Symptom: flicker or tearing (not sure what to call it) at the bottom of the
screen as seen in this videos:
Fedora 28 (old install): https://www.youtube.com/watch?v=q9tHH2LdYOc
Ubuntu 18.04 (currently installed, with glxgears info in description):
https://youtu.be/CsFHt74HY3A

Tested on: Debian Jessie KDE, Kubuntu 18.04, Fedora 28, Elementary OS Loki,
Ubuntu 18.04, all exact same symptom.

Hardware: Macbook Pro 11.5

lshw:
*-display                 
       description: VGA compatible controller
       product: Venus XT [Radeon HD 8870M / R9 M270X/M370X]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci at 0000:01:00.0
       version: 83
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:51 memory:80000000-8fffffff memory:b0c00000-b0c3ffff
ioport:3000(size=256) memory:b0c40000-b0c5ffff

Added TearFree, DRI3 and glamor to try to remedy the symptom, nothing changed:
cat /usr/share/X11/xorg.conf.d/20-radeon.conf 
Section "Device"
    Identifier "Radeon"
    Driver "radeon"
    Option "TearFree" "on"
    Option "DRI" "3"
    Option "AccelMethod" "glamor"
EndSection


Xorg log attached. Some device busy errors seen at the bottom, not sure if it
has any relation.

Nothing really interesting in dmesg.

Symptop appears even at single monitor, however, my current setup is triple
external plus native hidpi:
xrandr --fbmm 11520x4200 --output eDP --pos 4320x2400 --mode 2880x1800 --scale
1x1 --primary --output DisplayPort-1 --pos 0x0 --mode 1920x1200 --scale 2x2
--output DisplayPort-0 --pos 3840x0 --mode 1920x1200 --scale 2x2 --output
HDMI-0 --pos 7680x0 --mode 1920x1200 --scale 2x2

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