so i have two seemingly identical 2.0 only C-to-C USB cables. one that came with my Pixel 3, and one aftermarket.
plugged into my PC, the phone fast charges fine from either.
plugged into a power bank, the phone thrashes plugged with the second but not the first one
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The #grapheneos IRC/Matrix channel is largely a place to help people debug issues with their USB cables, ports and OS drivers. I'm convinced that most things with USB-C are broken. People have trouble believing that the brand new cable they got from Amazon is the problem though.
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If people are following the instructions correctly, the remaining issues are almost entirely USB related. Most problems are solved by people using a better cable or different ports on their computer. Some laptops seem to have half ports broken, or at least all USB-C broken.