Windows 7 only supports LFX and GFX.
Windows 10 supports SFX, MFX, and EFX. If a driver reports both (LFX, GFX) and
(SFX, MFX, EFX) then Windows 10 will prefer (SFX, MFX, EFX.)
For compatibility reasons, if a driver reports only (LFX, GFX), Windows 10 will
work with it.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of Michael Johansen <johansen.mic@xxxxxxxxx>
Sent: Tuesday, March 26, 2019 4:58:17 AM
Subject: [wdmaudiodev] Re: MFX APO on 7.1 endpoint
It turns out that if I attach the APO as an LFX (on windows 10) it works.
The driver is a WinRT driver but built for compatibility with Windows 7.
I was under the impression that SFX, MFX and EFX are the only APOs available in
Windows 10 and not LFX and GFX.
Do you know that properties of the driver determines this?
Den man. 25. mar. 2019 kl. 22.06 skrev Matthew van Eerde
No, it should just work.
behalf of Michael Johansen
Sent: Monday, March 25, 2019 9:15:16 AM
Subject: [wdmaudiodev] MFX APO on 7.1 endpoint
I am working on a PortCls driver for a 7.1 audio device. We have an existing
working APO that we have modified to support 7.1 audio. I am registering the
APO via the driver INF - business as usual - but it never gets loaded when
Any special registration required for this type of endpoint?