Comment 9 for bug 297245

Canonical in the US and Taiwan have been working with the Dell
       Linux Engineering team and the individual factories producing
       this model to identify a root cause and fix to this issue since
       your raised it with us.
       It appears to be specific to a batch of machines although
       without a definitive root cause we are not ruling other
       scenarios out.

       Your continued assistance in the issue is appreciated - there
       are very significant efforts that go into making sure that
       Ubuntu works excellently on Dell hardware and we are keen to
       understand what went wrong here both specifically and in the
       general process.

       Thank you for your assistance.