[wdmaudiodev] Re: ac97+ICH5 can not playback sound.
- From: "Hakon Strande" <hakons@xxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 1 Jun 2006 16:26:37 -0700
Dear Rai,
I am not sure this is the cause of your issue but the AC-97 spec is
essentially broken from a unified driver POV due to jack sharing wiring
techniques introduced around the time ICH5 appeared (but it also happens
on board designs with AC-97 codecs attached to other chipsets).
Background:
At some point the industry required a jack sharing system as some system
vendors wanted to ship a 5.1 codec system but didn't want the expense of
populating two 3-jack stacks on their Motherboards. I believe a
prominent chipset vendor's board design division came up with a jack
sharing arrangement on one 3 jack stack as follows:
Pink Jack: Primary function: MIC In. Secondary function C/LFE Out Green
Jack: Line Out with HP drive, no input function Blue Jack: Primary
Function: Line In. Secondary function Surround Out.
From a hardware perspective the input/output pins were wired in parallel
or there was a multiplexer in the codec to switch one set of pins
between input and the output in the codec.
The jack sharing combinations had system design specific variances (e.g.
MIC shared with Surround instead of C/LFE and Line In shared with MIC
instead of Surround) this "3 jack sharing scheme" became pretty much the
defacto standard for channel motherboard products.
In any case all shipped with IHV provided drivers/software to make this
all work correctly platform by platform, delineated in the INF via
SSID's. And so the spec was no longer suitable for unified chipset based
drivers.
You could try plugging your headset or speakers into one of the other
jacks to see if this is the issue you are seeing.
Microsoft created the UAA initiative which is requiring audio HW
solutions (like HD Audio) that can report the system design dependent
wiring of the codec to the OS in part to avoid this kind of problem in
the future.
Sincerely,
Hakon Strande
PM Integrated, Internal, External, and Wireless Audio Devices
MediaTech/DMD/Windows Client/Microsoft
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of rai
Sent: Thursday, June 01, 2006 4:09 PM
To: wdmaudiodev
Subject: [wdmaudiodev] ac97+ICH5 can not playback sound.
Hi All,
I am working on a AC97 driver for WinXP.
I started from the sample driver code provided by XDDK.
First time, I installed the driver on an Intel 845GE machine (ICH4),
the driver reported that : PrimaryCodecReady timed out.
then I modified
NTSTATUS CAdapterCommon::PrimaryCodecReady (void),
make sure that the function will always return STATUS_SUCCESS.
then, the driver can basically work (play/record) on ICH4.
After that I tried the driver on ICH5, it also report primary codec is
not ready,
after I did the same thing(modify the function), the driver can be
installed.
Device manager also report that the driver works properly.
But I can not hear any sound from the speaker jak.
I think there must be some difference between ICH4 and ICH5 on
controlling AC97 codec,
but I am not familiar with AC97 standard.
Does anybody here can help or has the same experience?
Thanks.
Rai.
2006-06-01
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe:
mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.com/
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.com/
Other related posts:
