MLP Report

Windows 7
Windows 7 64-bit
Class Driver
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.
Windows 7
Windows 7 64-bit
Windows Vista
Windows Vista 64-bit
PCI Hardware
Compliance
Test For
Systems
PCI Hardware
Compliance
Test For
Systems
Running
Windows Vista
(PCIHCT)
12/31/2009
385
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
Windows Vista
Windows Vista 64-bit
UAA Test -
Win7 (System)
UAA Test-
Vista(System)
12/01/2009
1394
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.
Window Vista
Window Vista 64-bit
1) Fidelity Test
( System,
Manual)
2) HDAudio
Class Driver
Fidelity Test
(System,
Manual)
6/1/2009
1418
Erratum
Fidelity is false-failing captured signals with high DC offset.
Relevant error message is "Test signal not detected on channel
(#). Base frequency is 0.something Hz; expected 997-ish Hz."
Window Vista
Window Vista 64-bit
HDAudio Class
Driver Fidelity
Test (System,
Manual))
6/1/2009
1402
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.