MLP Report

Errata and Contingencies
Operating System
Failing Test
Expiry Date
ID Number
Type
Error Description
Windows Vista
Vista:HDAudio Class Driver
Fidelity Test - Vista (System,
Manual)
07/31/2011
598
Erratum
Issue Description:
Windows Vista-
64bit
Win7:Class Drive Fidelity Test -
Win7 (System, Manual)
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.
windows 7
windows 7 -64bit
Windows Vista
Vista:HDAudio Class Driver
Fidelity Test - Vista (System,
Manual)
Win7:Class Drive Fidelity Test -
Win7 (System, Manual）
06/1/2011
1801
Erratum
Issue Description:
Windows Vista-
64bit
There is a test bug which causes the
measurement of system noise during Render
Power Transition Test to be about 3 dB worse
than it should be. This filter forgives errors up
to 6 dB.
windows 7
windows 7 -64bit
Windows Vista
Vista:HDAudio Class Driver Test -
Vista or Server08 (System)
Win7:Class Drive AC3 Test - Win7
(System)
06/30/2025
1256
Erratum
Issue Description:
Windows Vista-
64bit
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
windows 7 -64bit
Windows Vista
PCI Hardware Compliance Test
06/01/2011
401
Erratum
Issue Description: