Ok i tested it.
Without backport modules i was able to transfer about 150 MB in ad-hoc
mode at normal transfer rate. After 150 MB other computer (with orinoco
gold, no WEP nor WPA enabled) lost connection and my atheros machine
become unresponsible(although i was able to shutdown it normally with
power button).
After installing backports modules my transfer rate was limited to 185
Kbps and after around 15 MB connection was droped but i have responsible
system.
I'm attaching my dmesg and movie with my strange network manager after
it(not possible to take screenshot)
** Attachment added: "dmesg"
http://launchpadlibrarian.net/37026776/wifi_crash
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Connection droped or system crash whean trying to transfer large files over
wi-fi
https://bugs.launchpad.net/bugs/389891
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