MLP Report

Operating Systems
Notes
WHQL Testkit
Windows 7
Windows 7 64-bit
WLK1.6 for Windows 7 SP1 WLK1.6 for Windows 7 SP1
Errata and Contingencies
Operating System
Failing Test
Expiry
Date
ID
Number
Type
Error Description
Windows 7
Windows 7 64-bit
Class Driver
Fidelity Test -
Win7 (System,
Manual)
07/31/2015 598
Erratum
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 64-bit
Class Driver
AC3 Test - Win7
(System)
6/30/2025 1256
Erratum
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 64-bit
PCI Hardware
Compliance
Test For
Systems
12/01/2012 401
Erratum
The following PCI Compliance test failure is acceptable: Bit
15 (Bridge Configuration Retry Enable) in the Device
Control register (offset 8h) in the PCI Express Capability
table must be read-only and always return 0 as it is
reserved for devices other than PCI Express to PCI/PCI-X
Bridges. Assertion 13A41D3E-2576-41DC-A67C-
525DA3637CEA This failure is acceptable because this is a
PCIe 1.1 feature and the WLP requires compliance with
only PCIe 1.0a.
Windows 7
Windows 7 64-bit
USB Host
Controller
Compliance
(Automated)
12/01/2012 1787
Preview
Erratum
Errata 1787
XHCI spec compliance test is in preview
For further details visit: https://winqual.microsoft.com/ec/
Windows 7
Windows 7 64-bit
UAA Test -
Win7 (System)
6/1/2015 513
Erratum
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.