[wdmaudiodev] Re: USBAudio Driver Fails to Start In Vista
- From: DJ Sisolak <dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 24 Mar 2006 16:54:41 -0800
If this was working in XP using the class driver then it should work in Vista
using the class driver. If not, we broke something and it needs to be fixed
(the caveat being that the Vista class driver does check for more
descriptor/functional anomalies and errors when determining class compliancy).
I need to know the specifics about the device so I can dig into this further if
that is possible. I don't want to distress anyone either. J
Sam, could you send me more info about the device in question directly?
Thanks,
DJ Sisolak
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Sam Tertzakian
Sent: Friday, March 24, 2006 2:48 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: USBAudio Driver Fails to Start In Vista
Yes, I believe it is "a USB 2.0 device, on a USB 2.0 bus, running USB Audio
Class 1.0, at the speed of USB 1.1.".
It is a part of a USB Composite Device composed of two devices, video and audio.
"Is the firmware really that hard to change?"
Well what about all the people who have a device in their house that used to
work on XP but now does not work under Vista? It is not changing the firmware
that is difficult...it is getting the change to the thousands of people that
have the device in their house. Not only that, this device does not have
firmware...it is a chip.
I think it is going to be very distressing for people who have this problem. I
can tell you that I am distressed over it. This is the last thing I expected to
fail...since the hardware is using the MSFT in box driver directly.
All of this started because I was trying to answer Andrew's question about
stereo devices...and I happen to have a USB Audio stereo device.
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Friday, March 24, 2006 2:24 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: USBAudio Driver Fails to Start In Vista
Sam Tertzakian wrote:
Hi, Hakon,
Yes, it must be a USB 1.1 Audio on a USB 2.0 Bus.
Let's be very precise: we're talking about a USB 2.0 device, on a USB 2.0 bus,
running USB Audio Class 1.0, at the speed of USB 1.1. Right? There is no "USB
1.1 Audio".
When I load it in XP it says, "USB Audio" in device manager and for location it
says "Location 0 (USB 2.0 Video)".
Video? Really?
So are you saying that the firmware needs to be changed even thought it works
fine under XP (to specify an interval of 8 for the interface so it uses the
same 1ms data distribution of an USB 1.1 device)?
The EHCI driver will support iso pipes at high speed. USBAUDIO.SYS, which is
specific to audio class, apparently will not. To support more than one packet
per frame, the requests have to be submitted in multiples of 8. As I recall,
USBAUDIO.SYS submits 10 packets per request. That doesn't work.
Is it possible to write a Filter Driver to correct this problem?
I don't think so. Although many descriptor problems can be fixed, in this case
you'd have to rewrite the device descriptor before it went in to EHCI. Is the
firmware really that hard to change?
--
Tim Roberts, timr@xxxxxxxxx<mailto:timr@xxxxxxxxx>
Providenza & Boekelheide, Inc.
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