| Bug ID | 109359 |
|---|---|
| Summary | Flickering and artifacts on dual 4K displays from RX 570 |
| 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 | venemo@msn.com |
There are two Dell U2718Q 4K monitors connected to a Sapphire Pulse RX 570 ITX card, one using the DisplayPort output and the other using the HDMI output. There is a visible flickering artifact on both displays. There is no problem when only a single display is connected. Searching online yields a couple of results that suggest a workaround: manually increasing the shader and/or memory clock of the GPU. On the RX 570 the following commands can get rid of the problem: echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level echo "2" > /sys/class/drm/card0/device/pp_dpm_mclk echo "5 6 7" > /sys/class/drm/card0/device/pp_dpm_sclk However, I believe the amdgpu driver should be able to figure out the correct necessary clock settings on its own. The problem exists in Linux 4.19 and 5.0-rc1 as well.
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