Craig McQueen wrote:

> I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based (5392
> chipset). I'm trying to use it on a BeagleBone Black based system with
> 3.14.x kernel built with Yocto. We're using ConnMan 1.30 at the moment.

Try it with a _desktop x86_64 distribution_ , with a *recent kernel*
as Fedora: (WORK is gnome) https://alt.fedoraproject.org/pub/alt/live-respins/

> We've been finding some instabilities with it periodically disconnecting
> from some networks. So we tried upgrading the firmware file rt2870.bin
> from version 0.29 to 0.36. That seems to be more stable with the
> network. However, we're finding that it initially doesn't connect, until
> the Wi-Fi has been disabled and then re-enabled. '  scan wifi'
> and 'iwlist scan' don't return anything until Wi-Fi has been disabled
> and then re-enabled.

Don't use any wrapper(NM, ConnMan, wicd, ...), usually are buggy. You should
use raw commands "iw" and "wpa_supplicant". Hints:
https://wireless.wiki.kernel.org/en/users/documentation/iw and  wpa_supplicant
always running with "-Dnl80211"

> Have there been any Linux driver changes needed to support this 0.36
> firmware? Does anyone have any pointers on where to look to understand
> this behaviour between 0.29 and 0.36 firmware?

closed source, but old changelogs are available at:
http://rt2x00.serialmonkey.com/pipermail/users_rt2x00.serialmonkey.com/2013-September/006391.html

Related to latest firmware releases, ralink/mediatek guys say:
"According to the engineers comment, the firmware didn't change much
these years, just some bbp register update and led stuff."
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