Comment # 2 on bug 959230 from Oliver Neukum

(In reply to Takashi Iwai from comment #1)
> (In reply to Toomas Aas from comment #0)

> > Interesting thing is that this only happens if the system has 10 GB RAM. My
> > system has 2x1GB plus 2x4GB DIMMs, and when I remove one of the 4 GB DIMMs
> > (thus reducing the amount of memory to 6 GB) the problem does not appear. To
> > rule out the possibility of bad DIMM I have run memtest86 for several hours
> > without finding any problems, also the system is rock solid with 10 GB RAM
> > when I remove the USB wireless adapter and use wired Ethernet.
> 
> So this implies that the host side influences on the problem.
> Oliver, any clue?  Some DMA issue?

It does look like DMA. We need to determine which HC is used.

Please provide the output of "lsusb -t"