MLP Report

Operating System
Failing Test
Expiry
Date
ID
Number
Type
Error Description
Windows Vista
Windows Vista 64bit
Windows 7
Windows 7 64-bit
1) Fidelity Test -
Vista (System,
Manual)
2) HDAudio Class
Driver Fidelity
Test - Vista
(System, Manual)
3)Class Driver
Fidelity Test -
Win7 (System,
Manual)
4)Fidelity Test -
Win7 (System,
Manual)
1/31/2011
1801
Erratum
Fidelity Render Power Transition test does not work properly.
The test is not going to be enforced until a fix can be released.
Windows 7
Windows 7 64-bit
Class Driver
Fidelity Test -
Win7 (System,
Manual)
6/1/2011
1012
Erratum
Fidelity plays a quiet (-60 dB FS) test tone during System
Activity test which is filtered out of the noise level
measurement.
However, Fidelity is quite prone to glitches during system
activity... the glitches leak into the measured noise, causing
false failures.
Windows Vista
Windows Vista 64bit
Windows 7
Windows 7 64-bit
1) HDAudio Class
Driver Test -
Vista or Server08
(System)
2) Class Driver
AC3 Test - Win7
(System)
6/30/2025
1256
Erratum
The HD Audio class driver hdaudio.sys exposes AC-3 data
ranges on S/PDIF Kernel Streaming pins incorrectly.
The compressed AC-3 transport is "stereo", "16-bit", and at the
same sample rate as the uncompressed format. As such, AC-3
data ranges are expected to have MaximumChannels = 2, and
MinimumBitDepth = MaximumBitDepth = 16.
However, the HD Audio class driver sometimes incorrectly
exposes a MaximumBitDepth of 24 or even 32.
Windows Vista
Windows Vista 64bit
HDAudio Class
Driver Test -
Vista or Server08
(System)
1/31/2011
142
Erratum
Errata 142 The Vista version of the Microsoft HD Audio class
driver only plays 48 kHz sample rate audio over HDMI audio
devices; it does not play the required 44.1 kHz sample rate.
The Windows 7/Server 2008 R2 version of the Microsoft HD
Audio class driver, on the other hand, will play both 44.1 and 48
kHz sample rate audio over HDMI devices. This errata filter thus
only applies to Vista and the initial release of Windows Server
2008 (not to Windows 7 or Windows Server 2008 R2.)
Windows Vista
Windows Vista 64bit
HDAudio Class
Driver Test -
Vista or Server08
(System)
1/31/2011
1444
Erratum
PREVIEW FILTER - HDMI is required to support 44.1 kHz on
Windows 7
Errata 1444The Windows Vista HD Audio class driver does not
support 44.1 kHz sample rates. There is an errata to cover this
violation of AUDIO-0023. It was mistakenly applied to third-
party drivers.
As of Windows 7, the Windows Vista HD Audio class driver
supports 44.1 kHz sample rates on hardware that advertises
support for it. AUDIO-0023 is applicable.
This is a preview filter to allow vendors to ship with systems
that violated AUDIO-0023 but were incorrectly filtered by the
Vista filter.
Hardware that does not support 44.1 needs to be updated to
support 44.1, and advertise that support in a way that the
Microsoft HD Audio class driver can pick up on.
Third-party drivers need to relay this support to the OS
correctly.
Windows Vista
Windows Vista 64bit
Windows 7
Windows 7 64-bit
PCI Hardware
Compliance Test
For Systems
6/1/2011
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.