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Radeon HD 7770 (XFX)

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It's natively support. Don't inject anything with your bootloader

not exactly, I need running two monitors only recognizes the HDMI and without audio

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not exactly, I need running two monitors only recognizes the HDMI and without audio

True, VGA isn't supported on 7770, maybe framebuffer patching is needed but AFAIK it only blackscreen-ed. HDMI Audio is achieved through DSDT patching and AppleHDA

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Thanks for your response

Only with DVI-I works perfectly or just the HDMI also works perfectly
Together does not work the DVI-I, is black screen, only the HDMI works

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