[mariuscotan]

thanks for the links, i will have a look.

Actually i have nothing connected to the usb and i have made a fresh install of the last stable xbian version. I still have 100% cpu usage.

With this version it works good: XBian_2015.02.07_rpi.img.gz

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What is i make a sudo apt-get dist-upgrade ?

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I switched back to XBian_2015.02.07_rpi and now the idle CPU Usage ist about 10-20%, so much better... and the usb sound card, an 4 port usb hub + the nano transceiver are working.

There should be a bug at least in the last two versions which i have tried.