I am in an identical situation to the above comment (Guillaume LAURENT, Inspiron 8600, DMI Vendor "Dell Computer Corporation", Intrepid), applied modified Richard Hughes patch, recompiled, and the problem is fixed. The most recent kernel in ubuntu-proposed (-11 I believe) does not fix the problem.
I am in an identical situation to the above comment (Guillaume LAURENT, Inspiron 8600, DMI Vendor "Dell Computer Corporation", Intrepid), applied modified Richard Hughes patch, recompiled, and the problem is fixed. The most recent kernel in ubuntu-proposed (-11 I believe) does not fix the problem.