I was asking about the GPU, not the CPU. But if it's an AMD (Radeon) video card or integrated graphics controller, that might be your problem with multiple monitors. All AMD/ATI video cards have poor support in Linux-libre; they require a proprietary firmware blob to work fully. Perhaps your GPU also needs proprietary software for HDMI support. It could even be part of a digital restriction mechanism (DRM) scheme.

If that is the problem, it might be unfixable. You might just have to do without it. You might be able to use the VGA monitor port as an alternative.

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