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@Shadowghost It just occurred to me that you're using a DP->HDMI adapter. If that's the case, adapters can change everything (as you see here). It's very possible that in order to use your adapter, in addition to changing the port type, you may need to change the framebuffer to 0x3e920000 and you will probably need the No-hda-gfx device property to prevent kernel panic on wake.
EDIT: I may have misunderstood your question. If you're just changing the VGA port to an HDMI port, then your original guess (simple framebuffer patch) may work. If you are using a DP->HDMI adapter, then this post is relevant.
EDIT: I may have misunderstood your question. If you're just changing the VGA port to an HDMI port, then your original guess (simple framebuffer patch) may work. If you are using a DP->HDMI adapter, then this post is relevant.
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