MLP Report

Windows Logo Kits Used (WLK)
Microsoft website: http://www.microsoft.com/whdc/DevTools/WDK/DTM.mspx
Please check regularly for test kit updates from Microsoft. Please ensure latest filters updated
prior to WHQL run.
Operating Systems
Notes
WHQL Testkit
Windows 7
Windows 7 64-bit
WLK1.5 for Windows 7
WLK1.5 for Windows 7
Windows Vista
Windows Vista 64-bit
WLK1.5 for Windows Vista SP2
WLK1.5 for Windows Vista SP2
Errata and Contingencies
Operating
System
Failing Test
Expiry
Date
ID Number
Type
Error Description
Windows 7
Class Drive AC3
Test - Win7
(System)
6/30/2025
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.
Resolution Description:
This is an acceptable failure.
Windows 7 64-bit
Windows 7
1)Class Drive
AC3 Test - Win7
(System)
2) Fidelity Test -
Win7 (System,
Manual)
1/31/2011
1801
Erratum
Issue Description:
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.
Resolution Description:
This is an acceptable failure.
Windows 7 64-bit
Windows 7
1)Class Drive
AC3 Test - Win7
(System)
2) Fidelity Test -
Win7 (System,
Manual)
6/1/2011
1012
Erratum
Issue Description:
Fidelity uses too small of a buffer and wakes up
too infrequently during the System Activity test.
This causes errors like: Noise level during
system activity on (left or right) channel 73.2016
dB: *** FAIL *** (requirement >= 80 dB)
Resolution Description:
The signature of this failure is a lot of good-
looking noise measurements during System
Activity Test (noise levels down around -90 dBV)
with a few sporadic bad noise measurements (-
80 dB, -70 dBV) sprinkled throughout (where the
glitches happen.) This filter will forgive noise
level during system activity of up to -65 dB.
Windows 7 64-bit
Class Drive
Fidelity Test -
Win7 (System,
Manual)
7/31/2011
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
Windows 7 64-bit