PLMP Report

Windows 7
Windows 7 64-bit
UAA Test -
Win7 (System)
09/30/2010
2908/1198
Erratum
Preview Filter - Reserved "Impedance" bits in Pin Sense
response to digital pin widgets
The original HD Audio 1.0 specification contains a notion of
"presence detect", using electrical impedance which was
intended to apply only to analog pins. However, the language of
the specification was such that it could be read to apply to
digital pins as well - in particular, to S/PDIF pins.
A DCN was released to extend the notion of presence detect to
digital pins - in particular, to HDMI pins. This repurposed one of
the impedance bits, which were thought to be unused in digital
pins, to mean "ELD valid."
The correct way for a S/PDIF pin to respond to a Pin Sense verb
is to set the highest bit (Presence Detect) to 1 or 0
corresponding to whether a S/PDIF connection is active; set the
ELD Valid bit to 0 (since there is no such thing as ELD for
S/PDIF); and set the rest of the bits, which are reserved for
digital pins, to 0.
This errata filter is a preview filter to allow hardware
manufacturers time to update any hardware that used the
impedance bits on digital pins.
For further details visit: https://winqual.microsoft.com/ec/
Windows 7
Windows 7 64-bit
Class Driver
AC3 Test –
Win7 (System)
06/30/2025
1890/1256
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 7
Windows 7 64-bit
Signed Driver
Check (Manual)
12/31/2010
2701/1248
Erratum
If a driver is found to be signed by Microsoft that is tested with
the chklogo test, the message, ERROR: No Logo Level Attribute
on file., is an invalid failure if followed by, This file has a 0 level
Logo and followed by,Cannot match the device ID of the driver
the device was test within an invidual assertion.