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Monitor problem on UHD Lenovo y50-70 with OS Sierra


bepferr
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Hello everyone! I installed OS Sierra 10.12.6  on a Lenovo y50-70 with 4k monitor following the tonymacx86 guide (this: https://www.tonymacx86.com/threads/guide-lenovo-y50-uhd-or-1080p-using-clover-uefi.232960/ ). All is OK (except the bluetooth but I consider that a secondary problem) except that I can not absolutely activate the monitor! For example, I can connect an external monitor via HDMI and so doing everything OK. I would like to understand how to do it, does anyone have any idea? I have already set up the DVMT prealloc to 128mb with modified bios and installed coredisplayfixup in L / E but nothing. If I boot up setting clover id-ig 0x12345678 the monitor works but the graphics card is recognized only as 31mb and everything is slow, the web pages for example are unusable. I have an integrated intel hd4600 card. I hope you can help me, thank you so much in advance!

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