USB interface stopped working after update

[Bruno Tucunduva Ruviaro]

Hi,

I have Ubuntu studio 12.04 installed on one laptop, and regular Ubuntu on another (also 12.04). Until a few days ago, both systems used to work fine with a PreSonus AudioBox 1818VSL USB interface. All of a sudden, the two laptops are no longer working with this interface. My only guess is that this was caused by some kind of software update (I usually do all required & recommended updates suggested by Ubuntu).

To be more precise, Jack still sees the USB interface as before; I am able to start jack with the PreSonus, I see all the ins and outs in the connection window. But no sound seems to arrive in the hardware. No sound comes out. I used to see the AudioBox meters lighting up last week; they no longer light up this week. I've tested the audio interface on a Mac computer and it is working. In fact, if I boot Ubuntu studio from a live CD (that is, without any recent updates), the interface works again.

Has anything like this happened to other people this week? Any tips on how to solve the problem?

Thank you very much,

Bruno