MLP Report

Errata and Contingencies
Operating System
Failing Test
Expiry
Date
ID
Number
Type
Error Description
Windows Vista
Windows Vista 64bit
1) Fidelity Test -
Vista (System,
Manual)
2) HDAudio Class
Driver Fidelity
Test - Vista
(System, Manual)
6/1/2011
1801
Erratum
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.
Windows Vista 64bit
Hal timer tests
(HCT)
6/1/2011
1806
Erratum
The HAL Timer test can fail the KeStallExecutionProcessor
Backoff Test case due to an issue with the processor
implementation. This has been determined to be a problem with
the test.
Windows Vista
Windows Vista 64bit
HDAudio Class
Driver Fidelity
Test - Vista
(System, Manual)
7/31/2011
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 Vista
Windows Vista 64bit
HDAudio Class
Driver Test -
Vista or Server08
(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 Vista
Windows Vista 64bit
PCI Hardware
Compliance Test
For Systems
12/1/2012
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 Vista
Windows Vista 64bit
UAA Test - Vista
or Server08
(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.