Comment 167 for bug 435352

udelay(2000) - works (> 2 people)
udelay(1000) - works (knuutsen, catscrash)
udelay(600) - works (catcrash)
udelay(500) - works (deChrLam with method see # 148, stephan d.)
udelay(400)- works (knuutsen, stephan d.)
udelay(375) - breaks (stephan d.)
udelay(350) - breaks (stephan d.)
udelay(300) - breaks (catscrash)
udelay(250) - breaks (stephan d.)
udelay(100) - breaks (catscrash, stephan d.)
udelay(50) - breaks (stephan d., jbob)
udelay(48) - breaks (knuutsen)

I think we have a tripping point now. Thanks everybody for helping!
I'll get back to the USB developers with these values. In the meantime we could set up a PPA that contains the udelay(400) patch, I'll look into this once I have some time!