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Fix High Idle Power Consumption with AMD dGPU on Kernel 6.13
(programming.dev)
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These older (maybe also current) amd gpus for some reason defaults to higher vram speeds when a monitor has mor than 60hz. The fix requires generating a custom edid file, which is a great pain in the ass to get to work
This isn't true for Vega 10 and 20 due to their use of HBM2. In general what you're describing is a comparative weakness of GDDR as a technology. I don't think there's anything to suggest there's an inherent issue with idle power on older gen asics at >60 Hz save from the typical limitations with VBI compatibility in an array of panels or display bandwidth thresholds. In the case of VBI compact issues, modifying EDIDs can indeed help.
you're probably right, I have an RDNA1 card, I have no idea what could be causing this otherwise. probably some weird amd driver issue