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Hervé

Dell Latitude E6220 with i5-2520M, HD3000 and 1366x768 LCD - Mavericks/Yosemite/El Capitan/Sierra/High Sierra

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New bootpack with revised DSDT to include support for keyboard brightness keys Fn-UP/Fn-DOWN.

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Apologies if this comes up quite late after all those years but I've come to realize I never posted about the trick I've been using for some time to get rid of the small graphics glitches/corruption that inevitably effect the E6x20 HD3000 laptops; I'm talking about those defects such as horizontal black lines or occasional pixelisation that keep appearing over time, especially after repeated Sleep & Wake.

 

Now, for the life of me, I just can't remember where I found it (probably IM but I would not bet money on it) but using a SwitchResX-generated custom resolution with a 62Hz refresh rate fixed the issue on my E6220. I've set this as the default resolution using DisplayMenu app.

 

Details are as follows:

E6220_SwitchResX_01.jpg

 

E6220_SwitchResX_02.jpg

 

E6220_DisplayMenu.jpg

 

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