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ATI Radeon HD 5670 show scramble line above Apple logo. Help


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Using the latest Clover.  Everything works great on Yosemite 10.10 but after updating to Combo 10.10.5, it show scramble line above Apple logo then finally boot to login.  Everything beside that works fine. This is my video card:ATI Radeon HD 5670 Device ID 0x68D8.  Do I need to do anything to remove that scramble line?  Thanks

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I use the default one. I inject my devid with DSDT. I'm pretty sure that its an IOGraphicsFamily problem,there was a previous patch which I used that worked till 10.10.3 or .4.

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