Why some older Smart Covers are incompatible with Apple’s new iPad

“A manufacturing change in the new iPad appears to have broken compatibility with certain Smart Covers, as well as some third-party cases that use the iPad’s built-in magnets,” Sam Byford reports for The Verge.
“From video and photo evidence posted at Mark’s Hangout, it appears that the new iPad now uses a polarity-sensitive sensor to wake the device from sleep upon opening the cover, meaning that the magnet must be correctly aligned — apparently early Smart Covers were initially made with the magnet in question facing either way,” Byford reports.

Byford reports, “Newer Smart Covers don’t exhibit the problem.”

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