What controller are you using with the Deck?
My pick after searching around is the 8BitDo Ultimate C (link) which is the cheaper version of the ultimate with no dock. So far, it’s been working well for me. I just had to restart the Deck the first time after the pairing, since then, it recognize the device all the time.
Post your model below
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If you want a budget controller with lots of features, go on ebay and get a used Dualshock 4 (PS4 controller). It’s got a touchpad and gyro so you can do some interesting stuff with it.