MLP Report

Errata and Contingencies
Operating
System
Failing Test Expiry Date
ID Number
Type Error Description
windows 7
Win7: UAA
Test - Win7
(System)
06/01/2015
513
Erratum
Issue Description:
UAA Test requires the Traffic Priority bit to be
read/write - however there are two specs that apply,
and they conflict. One says the bit must be read/write,
the other says it must be read-only. Contact has been
made with the author of both specs (Intel) but until
this point is clarified we cannot fail submissions
containing this test failure.
windows 7
Win7:Class
Driver AC3
Test - Win7
(System)
06/30/2025
1256
Erratum
Issue Description:
Run AC3 test on a system with the
Microsoft HD Audio class driver installed. Expected
results: All AC3 kernel streaming
Data ranges should advertise
MinimumBitsPerSample = 16 and
MaximumBitsPerSample = 16. Actual
results: HD Audio class driver sometimes advertises
MaximumBitsPerSample = 24.
windows 7
Win7: Class
Drive Fidelity
Test - Win7
(System,
Manual)
7/31/2015 598 Erratum Issue Description:
The European Union requires the headphone output
level to be <= 150 mVrms for headphone jacks. There's
a note in WLP requirement AUDIO-0006 that states, in
the presence of regional regulations, the output level
requirement for headphones is dropped from >= 1000
mVrms to >= 120 mVrms. This provides freedom for
manufacturers to meet both the EU <= 150 mVrms @
32 Ohms and the WLP >= 120 mVrms @ 32 Ohms
requirements. The Fidelity Test tests headphones at
300 Ohm load, though. Without knowledge of the
output impedance at the jack, the test cannot
extrapolate what the output level at 32 Ohms would
have been from the output level at 300 Ohms. The test
assumes that the output level at 32 Ohms will be *less*
than the output level at 300 Ohms, though. So any
measurement >= 120 mVrms at 300 Ohms "could be" a
passing result, depending on the output impedance.