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Macbook 8,2 cant use external display

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Hello,

Since I bought my macbook pro in 2011 i've tried every ubuntu release to see if I could use it as my default develop OS.
Well, every stock release failed so far and as I didn't have time to mess around with it I always ended giving up.
So here we are again with version 14.10 to see if we can get this working ;)

This macbook has a dual GPU: a AMD Radeon HD 6750M and a Intel HD Graphics 3000.
I don't care about GPU switching, I just need one and my external monitor connected via display port working.

Since Intel is well supported in Linux, I searched the internet and found some grub commands to disable the discrete GPU and use the integrated instead:

Code:

outb 0x728 1
outb 0x710 2
outb 0x740 2
outb 0x750 0

Ubuntu boots fine and everything seems to work.. except the external monitor.
In the screen configuration panel I can see that the external monitor IS detected but nothing is displayed.
In the logs theres several of messages like this:

Code:

too many voltage retries, give up
failed to train DP, aborting

Can someone help me? ):P

PS: I've tried installing the AMD proprietary drivers and ubuntu can't even boot up with those.

Thanks and kind regards,

Pedro Saraiva

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