Raspberry Pi 4 bug apparently kills Wi-Fi when you crank up resolution

A Raspberry Pi 4 functioning as a desktop computer.Raspberry Pi Foundation

The Raspberry Pi 4 is a major leap forward for the platform, offering a big CPU boost and dual monitor support. Unfortunately, some users have reported a weird bug that seemingly kills Wi-Fi when you crank up the resolution.

More specifically, the Pi 4’s Wi-Fi stops working if it’s outputting at 2,560 x 1,440 or higher via HDMI, developer Enrico Zini noted on his blog. Zini adds that resolutions of 2,048 x 1,080 or below still work fine.

The developer also noted that he was able to reproduce this Raspberry Pi 4 glitch via both microHDMI outputs, two different HDMI cables (including one with an HDMI to microHDMI adapter), three different Raspberry Pi 4 devices, four different power supplies, and two different SD cards.

Several users on the Raspberry Pi Forum have also noticed this flaw, although it’s unclear what’s actually causing the issue. Some users suggest that it could be related to power consumption, interference from accessories, or software. It’s also possible that this isn’t a widespread issue, but rather a problem with a select few devices. Then again, the fact that Zini was able to reproduce the issue with three different devices is pretty notable.

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It wouldn’t be the first Raspberry Pi 4 flaw spotted by users though, as the computer’s USB-C charging port has “incorrect detection circuitry.” This design flaw means you can’t power the Pi 4 with so-called ‘e-marked’ USB-C cables used by many smartphones and laptops.

We’ve contacted the Raspberry Pi team for more clarification and will update the article accordingly. Have you come across this Wi-Fi issue with your Raspberry Pi 4? Then drop a comment below.

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