MLP Report

Errata and Contingencies
Operating System Failing Test
Expiry
Date
ID
Number Type Error Description
Window 7
Window 7 64-bit
1)AC3 Test
(System)
2)Class Driver
AC3 Test –
Win7 (System)
06/01/2010 1572
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 7
Windows 7 64-bit
1)Class Drive
Fidelity Test -
Win7 (System,
Manual)
2)Fidelity Test -
Win7 (System,
Manual)
12/31/2009 1547
Erratum
Fidelity Test now includes a "Render Power Transition" test.
This preview filter covers all errors in this new test of
SYSFUND-0050.
Window 7
Window 7 64-bit
1)Class Drive
Fidelity Test -
Win7 (System,
Manual)
2)Fidelity Test -
Win7 (System,
Manual)
12/01/2009 1670
Erratum
EU restrictions place a cap on the output level of headphone
jacks at 32 Ohm load: headphones are not allowed to have an
electrical output of more than 150 mV at that load.
We test headphone jacks at 300 Ohm load; the relationship
between the output at 32 Ohms and the output at 320 Ohms
depends on the output impedance of the headphone jack.
In particular, if a headphone jack meets the EU requirement of X
<= 150 mV at 32 Ohms, depending on the output impedance, it
could output a huge amount of power at 300 Ohms, or very
slightly over X mV. Since we require X >= 120 mV at 32 Ohms,
absent knowledge of the output impedance we can only require
X >= 120 mV at 300 Ohms.
120 mV is -18.42 dBV. Any headphone output level at 32 Ohms
that is less than -18.42 dBV is a legitimate failure, even if it is
targeted at EU compliance. Any headphone output level greater
than 1 Vrms (0.707 Vrms for mobile systems) is a legitimate
pass, regardless of EU compliance.
This errata covers output level failures for headphone jacks
between -18.42 dBV and 1 Vrms/0 dBV (0.707 Vrms/-6.93 dBV
for mobile systems)) in accordance with note 6 of the WLP
fidelity requirements.
Window 7
Fidelity Test -
Win7 (System,
Manual)
12/01/2009 1417
Erratum
Fidelity Test includes a "System Activity Test" that verifies
audio fidelity is not compromised during system activity.
It uses an activity generator called rws.exe (Real World Stress)
which has a bug that causes it to hit an access violation. When
this happens it exits with return code 0xC00000005, or -
1073741819.
Windows 7
Windows 7 64-bit
PCI Hardware
Compliance
Test For
Systems
12/31/2009 759
Erratum
ISSUE: PCI Compliance - Bit range 11:10 (ASPM Support)in the
Link Capabilities register (offset Ch) in the PCI Express Capability
table must be read-only. RESOLUTION: The following PCI
Compliance failure assertion is allowed 4D19D0E6-51CC-49CF-
8459-31AAA0587E4B.