Hi,

Exactly the same behaviour occurs for me.
My motherboard (ma78gm-us2h) is based on a amd 780g+sb700. When the two usb2 
device are plug on the same bus, the dvb works bad like there is conflict 
during the data transfer (the same thing occurred with a memory usb stick 
instaed of ralink wifi stick).
In such a case lsusb gives
Bus 001 Device 007: ID 148f:2573 Ralink Technology, Corp. RT2501USB Wireless 
Adapter
Bus 001 Device 002: ID 0413:6026 Leadtek Research, Inc. WinFast DTV Dongle 
(warm state)

But now when I plug the two usb2 devices on ports that are linked to two 
distinct ports, then the dvb stick works well.
In such a case lsusb gives
Bus 001 Device 004: ID 0413:6026 Leadtek Research, Inc. WinFast DTV Dongle 
(warm state)
Bus 002 Device 002: ID 148f:2573 Ralink Technology, Corp. RT2501USB Wireless 
Adapter

I have this effect with the lastest ubuntu distrib 
Linux multimedia 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 
i686 GNU/Linux
So the issue seems to remains on this version of the kernel.

juju27

-- 
Ralink-2500 USB 2.0 wireless + Hauppauge WinTV Nova-T USB 2.0 + AMD 780g
https://bugs.launchpad.net/bugs/256492
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