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I have a TP-LINK TL-WN722N wi-fi adapter, and I suffer from bad connection quality on ubuntu. Dowload speeds may vary from 3 MB/s down to 40 kB/s, ping is unstable a online games are unplayable. On windows it works flawlessly. Any ideas, what may cause the problem?

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is your router configured for wireless N? What is your wifi device in laptop (sudo lshw -c network) – Web-E Apr 19 '14 at 17:59
configuration: broadcast=yes driver=ath9k_htc driverversion=3.13.0-24-generic firmware=1.3 ip= link=yes multicast=yes wireless=IEEE 802.11bgn It runs on N mode, wifi hotspot is on bgn mode. Anyway same config on windows works perfectly, but on ubuntu not – Dmitry Avgustis Apr 19 '14 at 18:04
Try this - atheros wireless ar9285 driver , Please change the driver name from ath9k to ath9k_htc in above steps. (If those steps doesn't work, use sudo rm /etc/modprobe.d/ath9k_htc.conf and reboot to revert the changes) – Web-E Apr 19 '14 at 18:19
Tried this, didn't help unfortunately. I've also tried to download the latest .fw files from kernel web site for my adapter. They didn't help as well. I guess I'll have to give up on linux for a while unless I buy a new adapter – Dmitry Avgustis Apr 19 '14 at 19:38
Try disabling n mode in router – Web-E Apr 20 '14 at 4:30

Found a workaround, I used Windows Wireless Drivers tool

I used windows xp x64 driver, works fine.

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