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There is a lot of Graphics Problems with the DELL Latitude E6220

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There is a lot of Graphics Problems with the DELL Latitude E6220. There seems to be a lot of dashes and marks on the screen when you boot up with the Extra Folder from this website. I think there is a problem with the DSDT file.

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That's a known issue since Yosemite better known as 'Boot Glitch'. You have to patch IOGraphicsFamily. Use our forum search. There's a patch file in Hervé' guide.

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