I recently set up a new machine (specs below). The display is a PowerColor Radeon RX570 connected to an Acer CZ340CK 1. The screen has a bad flicker and horizontal grey bars flickering at the bottom.
After reading some other posts, I tried setting Compositor setting 'Tearing prevention ("vsync")' to "Full screen repaints". I then tried all permutations of this setting and 'Rendering backend' (XRender, OpenGL 2.0, OpenGL 3.1). I have also tried different cables and different types of cables.

Display settings has 3 options for "Refresh rate":

• Auto - flickers
• 74.92 Hz - flickers
• 59.94 Hz - monitor says "No signal"

In the process of debugging, I connected an old HP 2311x (1080P) monitor. When both are enabled, the flickering stops. My wild guess is that this is somehow affects the refresh rate on the primary display. I can't leave it connected, though, so that's not a solution.

The OS is currently Manjaro. The same issue was present with Kubuntu, but not with gnome derivatives.

I couldn't find much on the error message in here other than this issue, which I'm not sure is actually a causal factor.

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$ dmesg | grep amdgpu
[   13.086426] [drm] amdgpu kernel modesetting enabled.
[   13.114290] fb: switching to amdgpudrmfb from EFI VGA
[   13.114820] amdgpu 0000:08:00.0: No more image in the PCI ROM
[   13.117526] amdgpu 0000:08:00.0: VRAM: 4096M 0x000000F400000000 - 0x000000F4FFFFFFFF (4096M used)
[   13.117528] amdgpu 0000:08:00.0: GART: 256M 0x0000000000000000 - 0x000000000FFFFFFF
[   13.117614] [drm] amdgpu: 4096M of VRAM memory ready
[   13.117615] [drm] amdgpu: 4096M of GTT memory ready.
[   13.195017] amdgpu: [powerplay] Failed to retrieve minimum clocks.
[   13.195018] amdgpu: [powerplay] Error in phm_get_clock_info
[   13.438115] fbcon: amdgpudrmfb (fb0) is primary device
[   13.438117] amdgpu 0000:08:00.0: fb0: amdgpudrmfb frame buffer device
[   13.460166] [drm] Initialized amdgpu 3.27.0 20150101 for 0000:08:00.0 on minor 0


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$ inxi -Fx
System:    Host: eh-main Kernel: 4.19.36-1-MANJARO x86_64 bits: 64 compiler: gcc v: 8.3.0
           Desktop: KDE Plasma 5.15.4 Distro: Manjaro Linux
Machine:   Type: Desktop Mobo: ASUSTeK model: PRIME B450M-A v: Rev X.0x serial: <root required>
           UEFI: American Megatrends v: 0806 date: 01/18/2019
Battery:   Device-1: hidpp_battery_0 model: Logitech Wireless Mouse MX Master 2S
           charge: 100% (should be ignored) status: Discharging
CPU:       Topology: 6-Core model: AMD Ryzen 5 2600 bits: 64 type: MT MCP arch: Zen+ rev: 2
           L2 cache: 3072 KiB
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 81471
           Speed: 3349 MHz min/max: 1550/3400 MHz Core speeds (MHz): 1: 2793 2: 1270 3: 1547
           4: 1546 5: 1270 6: 1543 7: 1546 8: 1547 9: 2797 10: 1273 11: 1272 12: 1547
Graphics:  Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] vendor: Tul
           driver: amdgpu v: kernel bus ID: 08:00.0
           Display: x11 server: X.Org 1.20.4 driver: amdgpu FAILED: ati unloaded: modesetting
           resolution: 3440x1440~75Hz, 1920x1080~60Hz
           OpenGL:
           renderer: Radeon RX 570 Series (POLARIS10 DRM 3.27.0 4.19.36-1-MANJARO LLVM 8.0.0)
           v: 4.5 Mesa 19.0.3 direct render: Yes
Audio:     Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] vendor: Tul
           driver: snd_hda_intel v: kernel bus ID: 08:00.1
           Device-2: AMD Family 17h HD Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel
           bus ID: 0a:00.3
           Sound Server: ALSA v: k4.19.36-1-MANJARO
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK
           driver: r8168 v: 8.045.08-NAPI port: f000 bus ID: 07:00.0
           IF: enp7s0 state: up speed: 1000 Mbps duplex: full mac: 04:d4:c4:23:e9:ce
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A
Drives:    Local Storage: total: 223.57 GiB used: 14.42 GiB (6.5%)
           ID-1: /dev/sda model: SATA SSD size: 223.57 GiB
Partition: ID-1: / size: 210.11 GiB used: 14.42 GiB (6.9%) fs: ext4 dev: /dev/dm-0
           ID-2: swap-1 size: 8.80 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/dm-1
Sensors:   System Temperatures: cpu: 44.8 C mobo: N/A gpu: amdgpu temp: 60 C
           Fan Speeds (RPM): cpu: 0 gpu: amdgpu fan: 246
Info:      Processes: 386 Uptime: 2d 19h 55m Memory: 15.65 GiB used: 8.09 GiB (51.7%)
           Init: systemd Compilers: gcc: 8.3.0 Shell: bash v: 5.0.3 inxi: 3.0.33


Same issue, ths works for me ; https://www.youtube.com/watch?v=JUpL8giZx4Al

> Same issue, ths works for me ; https://www.youtube.com/watch?v=JUpL8giZx4Al

@biomegaca How exactly does this Windows solution help us in KDE?