Comment # 1
on bug 108941
from Rigo Reddig
I've just recently chatted to boukehaarsma23 about it, as it also affects me. I have uploaded a video of what this looks like which you can see here: https://www.youtube.com/watch?v=roHXWtHRhyQ Interestingly the artifact lines appear to be aligned across the screens, vsync? The main reason though I first came across this is by trying to manually downclock my GPU. With 2x 60Hz HDMI 1080p monitors attached the GPU is constantly in a higher power state (both mclkc and sclk) and wastes a considerable amount of power at idle. This is not a problem with 1 monitor attached. Also of note is that even with 2 monitors attached this does not occur on Windows where the GPU idles at 300MCLK/300SCLK and is significantly cooler. For comparison about power, according to my UPS my system idles at 112-128W when the GPU's are downclocking appropriately(1 monitor). This measurement matches with Windows where the GPU is downclocking to state 0 appropriately. When it's not downclocking appropriately (2x monitors) it idles at anywhere between 160-176Watt. Setup: 2x RX580 Gigabyte 8G (Monitors both on GPU0) Linux 4.19.4 (Arch Main) Latest stable KDE Plasma on X
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