This is definitely a bug in the drivers for this wifi card. I've got another HP 4730s laptop, I checked and there is another wifi card: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI- Express) (rev 01). I switched the cards. The other laptop works only using Windows 7, there is no problem with my card. After switching the cards, my laptop works without any problem on Windows 7 and Linux.
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